I think it's easily evident that Brady isn't the same brady from 03-04. Wether good or bad, he's older, and isn't a kid in wonderland anymore.
He isn't nearly as excited on the sidelines.
I think it's more thna just his passion for the game, I think the locked room is probably a cancerous place... I bet all the talk of sending players home, players being helthy scratches, and all the other locker room drama, plus the failures in Indy and N.O. It all adds up to a overly stressful, drama fille dseason that he nor Belichick cared much for,
When it showed TB and BB on the sidelines talking this year, you could almost read their minds with them thinking... "My god I miss the teams from a few years ago"
The Patriot Way is to not talk, there is so much more we are not hearing, I whole heartily believe the locker rooom, and team aspects simply weren't there. No faith in anyone to do their job = lack of effort on all facets of the game.
BRady isn't god, and he is susceptible to playing poorly based on the emotion of the locker room. He probably doesn't have the leaders, friends, and teammates he once had... and he's drained.
You will never see a Tom Brady of 03-04 again. That team was tight, you could name what felt liek 15 players on that team where you could see themn all hanging out at each others house in the off season. All that's gone, he's stuck with young guys, attitude guys, complainers, and whiners, which is why you see him talking to BB so much rather than his teammates. He feels closer to hsi coach than to many of his teammates.
I fully expect many players to be gone in the off season.