lol. The "Gospel proofs" in the WCF are all from Scripture, Mark, not from "secondary commentaries," whatever that is.
The whole bit about Judgement is on our deeds
Rome was wrong on that one centuries ago, and it is still wrong (and there's no "e" in the judgment "bit."
"For the children being not yet born, neither having done any good or evil, that the purpose of God according to election might stand, not of works, but of him that calleth" -- Romans 9:11
Perhaps you are unfamiliar with the WCF, Dr. E. Pray allow me to enlighten you.
Point the 1st. Your claim that the Gospel proofs are all from Scripture means in the WCF that they are Scriptural, not necessarily from the Gospels, but from anywhere in Scripture and mostly from snippets of Paul or from unrelated areas of the OT.
Point the 2nd. The secondary commentaries are Scriptural quotes that are related in the opinion of the authors to the point of the WCF statement, yet supporting or a commentary on the main proof of that statement.
Example: III. Dipping of the person into the water is not necessary; but Baptism is rightly administered by pouring, or sprinkling water upon the person.[10]
[10] HEB 9:10 Which stood only in meats and drinks, and divers washings, and carnal ordinances, imposed on them until the time of reformation. 19 For when Moses had spoken every precept to all the people according to the law, he took the blood of calves and of goats, with water, and scarlet wool, and hyssop, and sprinkled both the book, and all the people, 20 Saying, This is the blood of the testament which God hath enjoined unto you. 21 Moreover he sprinkled with blood both the tabernacle, and all the vessels of the ministry. 22 And almost all things are by the law purged with blood; and without shedding of blood is no remission. ACT 2:41 Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls. 16:33 And he took them the same hour of the night, and washed their stripes; and was baptized, he and all his, straightway. MAR 7:4 And when they come from the market, except they wash, they eat not. And many other things there be, which they have received to hold, as the washing of cups, and pots, brasen vessels, and of tables.
This a random example in which Paul is cited as the main proof, and Acts and Mark are merely distantly related commentaries.
The whole bit about Judgement is on our deeds
Rome was wrong on that one centuries ago, and it is still wrong (and there's no "e" in the judgment "bit."
There is an 'e' in Judgement wherever proper English is spoken. And I love the trivialization of the "judgment bit". Matthew is heavily concerned with Judgement of all men; the Calvinists dismiss it and haughtily claim that only the damned will be Judged (the Calvinists will be Judged according to their Calvinism and therefore found to be saved from before the beginning of the world).
Jesus says Judged on our deeds and therefore Judged we will be. Regardless of the high school council crowd.