Because Brady and the Pats are still doing things that others have not. You are basically saying that both the Pats and NE are doing things that THEY have done before, not others.
At this point, Brady is on pace for 40 total TD (when you add in rushing TD). He currently has accounted for 32 TD to just 4 turnovers. NE is on pace for 581 points scored (a handful less than their record breaking season). They lost 3 games this year . . . by 1, 1, and 2 points . . . all on the last play of the game.
Brady may not win, but he certainly has a resume this year to merit him being one of the front runners for MVP.
Brady and Manning are having great seasons, but not all-time great seasons. Meanwhile CJ, Aldon Smith and possibly Watt
are. I think that's relevant.Like most people (I suspect), I don't think of the MVP as literally being the 'most valuable' player (what that even means is up for debate). You could easily make the argument that RG3 is actually the most valuable player to his team this year. But that doesn't mean he should get the MVP (maybe it should!).
I think of the MVP as the player that does the most with the least (team situation wise, I don't mean relative to their own ability). Brady does a lot, but he's also on a great team that's proven it can win games without him. Manning has increased the play of the Broncos a tremendous amount, but they actually won a playoff game last year.
Calvin Johnson and Adrian Peterson, on the other hand, are putting up monster seasons on teams that aren't as good and can't gain yards any other way (Lions are 21st in rushing, Viks are dead last in passing). To me that matters.
If your idea of MVP is literally the "most valuable" player, how do you interpret that? Is it the player who's team would have the biggest drop in performance without him? If so, I'd put Brady behind Peterson, Rodgers, RG3 and probably some other people. Is it who's having, statistically, the best season?
If so Brady, who's having a great season, is behind CJ, Aldon Smith, and JJ Watt who will likely have historic seasons.
The only interpretation in which I see Brady as the front runner is the following:
QB is the most important position, therefore the MVP should be the QB that's done the most, regardless of team situation (meaning being on a great team doesn't penalize you). That's definitely Brady.