They should have to split it. Especially if the Eagles win out.
I don't think there's enough seperating them. Brady has better numbers but Vick has things like the game against Washington, the comeback against the Giants.
There's precedent for splitting the award between two QBs so I don't see what the issue would be. When McNair and Manning split it:
McNair was 3215 yards, 24 TDs, 7 INTs + 4 rushing TDs playing 14 games on a 12-4 team.
Manning was 4267 yards, 29 TDs, 10 INTs on a 12-4 Indy team.
Situations seem very similar to me even down to McNair missing some games like Vick has. But this time I think the two players are a lot closer.