I agree something hasn't been right since.
Before Timmons blow to head:
22/31 335 yards - 70.9% Completion - 4 TDs - 1 Int - YPA 10.8
41/97 478 yards - 42.26% Completion - 1 TD - 3 Int - YPA - 4.9
He looks shook...maybe he got a little concussed.
Pick any hit from any game over the last 4 years and the stats will be similar. Everyone knows that if you smack him once in a game he is ruined for about a half dozen games.