Nothing is outside of God's created plan because as God tells us Himself...
"Declaring the end from the beginning, and from ancient times the things that are not yet done, saying, My counsel shall stand, and I will do all my pleasure" -- Isaiah 46:10
Satan is a created being. Any time God doesn't want him to prowl the earth, all He has to do is erase him from existence in less than the blink of an eye.
Further, if, as Scripture tells us, Jesus Christ is the "Lamb slain from the foundation of the world," then of course God likewise purposed Adam and Eve's fall from the foundation of the world, or else you would have God ordaining an offering for something that had yet to occur in the mind of God, which is ridiculous.
Amen. And He further states,
Proverbs 16:4 The LORD hath made all things for himself: yea, even the wicked for the day of evil.
5 Every one that is proud in heart is an abomination to the LORD: though hand join in hand, he shall not be unpunished.
God's first cause in creating is ALWAYS goodness which cannot be sin and evil
“God saw all things that he had made, and they were very good “(Gen. i, 31): “He made all things good in his own time” (Eccles. iii, 11): “Every creature of God is good (1 Tim. iv, 4).
God did not plan the sin of Adam and Eve or any sin!
If this were true than Christ suffered for His own planned sins which cannot be possible since Christ is God and sinless
You insist on ignoring God's foreknowledge and creating us anyway out of Love so that we can freely come to Him.
I wish you a Blessed day
Man is not the measure of God.
To God be the glory!