So what actually gets defined as "winning a SB?" Do any of the 18 games before the SB count? NE likely would not have even been in the SB without Brady.
The one thing even I have not discussed is Brady's leadership ability and ability to get his teammates to believe that they can win when they many times are less skilled than their opponents. Colin Cowherd had a funny bit about the game. He said Tom Brady just won the Super Bowl throwing to one guy. A 5'9" slot receiver who was a quarterback in college who looks like Santa Claus.
Brady really didn't have a ton to work with in terms of receiving talent this year. It was mostly Edelman, White out of the backfield, and Gronk at 60%.
Even though Brady didn't have a great game, he still led another 4th quarter game winning drive in the Super Bowl. As Edelman said at his press conference, it's better to win an ugly game than to win a pretty one.
So I agree that IN THE GAME ITSELF, Brady didn't do much and did enough to win, Brady had a huge impact in GETTING to the Super Bowl.