Hmm, good question. Might just be different packages and looks, maybe? Although you don't pay a guy 8.5M to not be on the field 3 downs, or at least mostly.
Gratz for getting him though. Kinda hoped the Pats would make a bid for him, but apparently the Ravens made him feel more wanted. Guess that's where those shrewd business dealings come to bite NE in the rear, in deals like this and Welker's where players pretty much choose a place where they feel wanted over a place where they might earn a tad more but are expendable.