Here's my final say of the subject for now since I've gotta go to work:
Tom Brady is not a system quarterback. He's really damn good, and when he was in his prime, I think he could have been an MVP candidate on pretty much any team in the league because his decision making and clutch play is out of this world. I've got him in my top-3 easily with Peyton Manning and Joe Montana, but I do probably have him third as of right now.
HOWEVER: the main point I've been trying to make for the last ~18 hours is that Brady has won so much because he gets a lot of help from his team, more than most great QBs get, and he has had a relatively lucky track record compared to other great QBs.
Example, Tom Brady's W-L record in the playoffs when throwing more INTs than TDs (minimum 30 passing attempts in the game) is 5-4.
Every other quarterback since 1950 is 19-150. Brady has over 20% of the wins in playoff scenarios where QBs play relatively poor games.
Tom Brady has more seasons with a top-10 defense than Peyton Manning, Aaron Rodgers, and Drew Brees combined. If Drew Brees had those defenses, I feel like he'd have more than one ring. Ditto Aaron Rodgers. The Packers had the 22nd ranked defense this year and an idiot at head coach. Give Tom Brady the 22nd ranked defense and Mike McCarthy instead of Belichick and I guarantee he misses the playoffs this year.
I'm not trying to discredit Brady. I'm just saying he's had a lot of things slide his way to get him five rings and a serious chance at his sixth this year, without even getting into the deflategate bullshit.