Nice post. Good points.
As you say, there will probably never be another QB with the decision making of TB, so anyone would suffer in comparison. You know, I agree, I'm not really that worried about Brissett's decision making in the long term either, I worded that badly. The word I wanted to use about his college career was "lack of polish", but I was having trouble defining the term. I guess by that I mean "readiness to contribute on a NFL level" or "readiness to reach one's potential". Having professional maturity and good intangibles is part of it. I guess it is something hard to define (maybe Ken can give a try) "but I know it when I see it".
My idea of a polished player is someone like Hightower, from a top program with excellent coaching, has played well in the biggest games (National Championships), professionally mature. Andrew Luck was polished coming out of college, great intangibles, great QB coaching at Stanford, lots of experience in big games, and Luck contributed right away for the first three years (before Grigson and the Indy front office ruined the Colts). Everyone likes to make fun of the skinny pictures of Brady at the Combine, but he was actually a very polished player, sky high intangibles, he had played on big stages and mounted big comebacks, had good coaching (apart from his coach's inability to judge QB talent). By the second year he was not only contributing, but winning a Super Bowl.
IMHO, Brissett (and Jimmy G. for that matter) weren't very polished coming out of college, and I think it is asking a lot for Brissett to win a Super Bowl with this very talented team this year if Brady is injured and Jimmy G. traded. Perhaps part of it was that Brissett played on a lousy team in college with a terrible OL and he was always having to try to do too much. However, that is not a slam at Brissett, as far as I can tell there have only been two 24 year old second year QB's who have won Superbowls, and one starts for the Pats (the other is Big Ben). And, to his credit, I was very impressed by how much better and more polished Brissett was for the Pats. I have high hopes for Brissett, I just don't think he is ready to join Brady and Big Ben as the next 24 year old second year QB to win a Super Bowl.