Bob seems to think that this is a credible authority. Well, it may have been in the early 1700s (Matthew Henry died in 1714. His commentary first appeared in 1706.) Nearly all of Bob's citations come from books that predate the twentieth century, let alone the twenty-first. To pontificate on the canon without bothering to get up to speed with modern studies is a lot like trying to treat high blood pressure with leeches.
The canon question is one of the "trunk of the tree" issues for understanding not only what the Bible is, but just as importantly what it isn't. Bob launches into rampant fantasy when he tries to proof-text his position by citing a verse in Isaiah:
The Old Testament Book of Isaiah prophesied that the LORD’s disciples would bind up and seal the Bible. Notice the following:
Bind up the testimony, Seal the law among my disciples (Isaiah 8:16).
To suggest that this has anything to do with the New Testament comes close to willful stupidity. On this dubious basis Bob proceeds to build his house of cards.
Bob finishes with a quote from Bauer's Orthodoxy and Heresy in Earliest Christianity. Well, not actually Bauer himself, but a comment from James Moffatt (the guy who translated the Bible in the 1930s) which appears in an appendix to that book. I'd recommend Bob actually read the full book (which I suspect he hasn't - want to borrow my copy Bob?) rather than cherry-picking quotes. Bauer's book is one of the truly ground-breaking studies in early church history, and while Moffatt may have had reservations about his thesis, he would surely have laughed out loud at the rigidly fundamentalist twist Bob gives to his words.
Again, Harry Gamble's book is one Bob should sit down with. Also highly recommended is Lee McDonald's The Formation of Christian Biblical Canon. McDonald isn't a wicked liberal or agnostic, but a Baptist pastor and a professor at Fuller. In the meantime, it might be wise to retire Matthew Henry's three hundred year-old commentary and update to Eerdmans. Realistically though, I can't see Bob doing any of the above.
Did John finalize the New Testament canon?
Not a chance.