Jospeh Smith, as a Prophet and Apostle of Jesus Christ will have the same role as the other Apostles, like Peter, James, and John...whatever that may be.

Whatever?

Seems like there has been some LDS leaders who have made comments on this:

"He (Joseph Smith) is the man through whom God has spoken... yet I would not like to call him a savior, though in a certain capacity he was a god to us, and is to the nations of the earth, and will continue to be."

- Brigham Young, Journal of Discourses 8:321

"You call us fools; but the day will be, gentlemen and ladies, whether you belong to this Church or not, when you will prize brother Joseph Smith as the Prophet of the Living God, and look upon him as a god..."

- Herber C. Kimball, Journal of Discourses 5:88

"If we get our salvation, we shall have to pass by him [Joseph Smith]; if we enter our glory, it will be through the authority he has received. We cannot get around him [Joseph Smith]"
- (as quoted in 1988 Melchizedek Priesthood Study Guide, p. 142)

There is "no salvation without accepting Joseph Smith. If Joseph Smith was verily a prophet, and if he told the truth...no man can reject that testimony without incurring the most dreadful consequences, for he cannot enter the kingdom of God"

- Joseph Fielding Smith, Doctrines of Salvation, vol. 1, p.190

"I tell you, Joseph holds the keys, and none of us can get into the celestial kingdom without passing by him. We have not got rid of him, but he stands there as the sentinel, holding the keys of the kingdom of God; and there are many of them beside him. I tell you, if we get past those who have mingled with us, and know us best, and have a right to know us best, probably we can pass all other sentinels as far as it is necessary, or as far as we may desire. But I tell you, the pinch will be with those that have mingled with us, stood next to us, weighed our spirits, tried us, and proven us: there will be a pinch, in my view, to get past them. The others, perhaps, will say, If brother Joseph is satisfied with you, you may pass. If it is all right with him, it is all right with me. Then if Joseph shall say to a man, or if brother Brigham say to a man, I forgive you your sins, "Whosoever sins ye remit they are remitted unto them;" if you who have suffered and felt the weight of transgression—if you have generosity enough to forgive the sinner, I will forgive him: you cannot have more generosity than I have. I have given you power to forgive sins, and when the Lord gives a gift, he does not take it back again."

- Orson Hyde, Journal of Discourses, Vol. 6, p.154-155

"It is because the Lord called Joseph Smith that salvation is again available to mortal men.... If it had not been for Joseph Smith and the restoration, there would be no salvation,"

- Bruce McConkie, Mormon Doctrine, p. 396, 670

They succeeded in killing Joseph, but he had finished his work.

He was a servant of God, and gave us the Book of Mormon.

He said the Bible was right in the main, but, through the translators and others, many precious portions were suppressed, and several other portions were wrongly translated; and now his testimony is in force, for he has sealed it with his blood.

As I have frequently told them, no man in this dispensation will enter the courts of heaven, without the approbation of the Prophet Joseph Smith, Jun.

Who has made this so?

Have I?

Have this people?

Have the world?

No; but the Lord Jehovah has decreed it.

If I ever pass into the heavenly courts, it will be by the consent of the Prophet Joseph.

If you ever pass through the gates into the Holy City, you will do so upon his certificate that you are worthy to pass.

Can you pass without his inspection?

No; neither can any person in this dispensation, which is the dispensation of the fulness of times.

In this generation, and in all the generations that are to come, everyone will have to undergo the scrutiny of this Prophet.

They say that they killed Joseph, and they will yet come with their hats under their arms and bend to him; but what good will it do them, unless they repent?

They can come in a certain way and find favor, but will they?

Brigham Young,

--JOURNAL OF DISCOURSES, vol. 8, p. 224

The Doctrine and Covenants

Section 132

Revelation given through Joseph Smith the Prophet, at Nauvoo, Illinois, recorded 12 July 1843, relating to the new and everlasting covenant, including the eternity of the marriage covenant, and also the plurality of wives (see History of the Church, 5:501–7). Although the revelation was recorded in 1843, it is evident from the historical records that the doctrines and principles involved in this revelation had been known by the Prophet since 1831.

1–6, Exaltation is gained through the new and everlasting covenant; 7–14, The terms and conditions of that covenant are set forth; 15–20, Celestial marriage and a continuation of the family unit enable men to become gods; 21–25, The strait and narrow way leads to eternal lives; 26–27, The law is given relative to blasphemy against the Holy Ghost; 28–39, Promises of eternal increase and exaltation are made to prophets and Saints in all ages; 40–47, Joseph Smith is given the power to bind and seal on earth and in heaven; 48–50, The Lord seals upon him his exaltation; 51–57, Emma Smith is counseled to be faithful and true; 58–66, Laws governing the plurality of wives are set forth.

16Therefore, when they are out of the world they neither marry nor are given in ^amarriage; but are appointed angels in ^bheaven, which angels are ministering ^cservants, to minister for those who are worthy of a far more, and an exceeding, and an eternal weight of glory.

17For these angels did not abide my law; therefore, they cannot be enlarged, but remain separately and singly, without exaltation, in their saved condition, to all eternity; and from henceforth are not gods, but are ^aangels of God forever and ever.

18And again, verily I say unto you, if a man marry a wife, and make a covenant with her for time and for all eternity, if that ^acovenant is not by me or by my word, which is my law, and is not sealed by the Holy Spirit of promise, through him whom I have anointed and appointed unto this power, then it is not valid neither of force when they are out of the world, because they are not joined by me, saith the Lord, neither by my word; when they are out of the world it cannot be received there, because the angels and the gods are appointed there, by whom they cannot pass; they cannot, therefore, inherit my glory; for my house is a house of order, saith the Lord God.

19And again, verily I say unto you, if a man ^amarry a wife by my word, which is my law, and by the new and ^beverlasting covenant, and it is ^csealed unto them by the Holy Spirit of ^dpromise, by him who is anointed, unto whom I have appointed this power and the ^ekeys of this priesthood; and it shall be said unto them—Ye shall come forth in the first resurrection; and if it be after the first resurrection, in the next resurrection; and shall inherit ^fthrones, kingdoms, principalities, and powers, dominions, all heights and depths—then shall it be written in the Lamb’s ^gBook of Life, that he shall commit no ^hmurder whereby to shed innocent ⁱblood, and if ye abide in my covenant, and commit no murder whereby to shed innocent blood, it shall be done unto them in all things whatsoever my servant hath put upon them, in time, and through all eternity; and shall be of full force when they are out of the world; and they shall pass by the angels, and the gods, which are set there, to their ^jexaltation and glory in all things, as hath been sealed upon their heads, which glory shall be a fulness and a continuation of the ^kseeds forever and ever.

20 Then shall they be gods, because they have no end; therefore shall they be from ^aeverlasting to everlasting, because they continue; then shall they be above all, because all things are subject unto them. Then shall they be ^bgods, because they have ^call power, and the angels are subject unto them.

21Verily, verily, I say unto you, except ye abide my ^alaw ye cannot attain to this glory.

22For ^astrait is the gate, and narrow the ^bway that leadeth unto the exaltation and continuation of the ^clives, and few there be that find it, because ye receive me not in the world neither do ye know me.

23But if ye receive me in the world, then shall ye know me, and shall receive your exaltation; that ^awhere I am ye shall be also.

24This is ^aeternal lives—to ^bknow the only wise and true God, and Jesus Christ, whom he hath ^csent. I am he. Receive ye, therefore, my law.

25^aBroad is the gate, and wide the way that leadeth to the ^bdeaths; and many there are that go in thereat, because they ^creceive me not, neither do they abide in my law.

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Praise to the Man!

Praise to the man who communed with Jehovah!
Jesus annointed that Prophet and Seer.
Blessed to open the last dispensation,
Kings shall extol him, and nations revere.

Chorus
Hail to the Prophet, ascended to heaven!
Traitors and tyrants now fight him in vain.
Mingling with Gods, he can plan for his brethren;
Death cannot conquer the hero again.

Praise to his mem'ry, he died as a martyr;
Honored and blest be his ever great name!
Long shall his blood, which was shed by assasins,
Plead unto heav'n while the earth lauds his fame.

Chorus
Hail to the Prophet, ascended to heaven!
Traitors and tyrants now fight him in vain.
Mingling with Gods, he can plan for his brethren;
Death cannot conquer the hero again.

Great is his glory and endless his priesthood.
Ever and ever the keys he will hold.
Faithful and true he will enter his kingdom,
Crowned in the midst of the prophets of old.

Chorus
Hail to the Prophet, ascended to heaven!
Traitors and tyrants now fight him in vain.
Mingling with Gods, he can plan for his brethren;
Death cannot conquer the hero again.

Sacrifice brings forth the blessings of heaven;
Earth must atone for the blood of that man.
Wake up the world for the conflict of justice.
Millions shall know 'Brother Joseph' again.

Chorus
Hail to the Prophet, ascended to heaven!
Traitors and tyrants now fight him in vain.
Mingling with Gods, he can plan for his brethren;
Death cannot conquer the hero again.