Part of the genius of Pete Carroll, I believe in hindsight, is that he recognized early on that plays were going to break down at a much higher rate with Wilson than with any other more conventional quarterback, so he made a plan for that. What happens after the scripted play dies? Yardball happens. And the Seahawks actually made that part of the practice routine. I think it was even a doctrine here that every pass play exists in two parts -- the scripted part, and the part that happens after the scripted part breaks down. And we practiced that. And our receivers got good at executing the second part, and became the security blanket for Russ.
Russ doesn't have that security blanket in Denver. (What he does have is a spare tire. He's older now, but he's still only 34, and that's way too young to lose that much speed and agility unless his knees have been wrecked at some point. His age isn't his issue physically, his weight is.) He never gets to the unscripted part of his plays because nobody there knew he needed that, and so nobody prepared for it, and suddenly Russ has no security blanket.
The other part of the Russ problem is his head is seriously messed up. I think keasley45 is right, his confidence is shot. He pumped himself up so full of himself that I'm not sure if he understands what is real any longer. I mean, can he distinguish between the realities he tried to create for himself and the hard reality that doesn't give a shit what you think? It's like there is a part of him that is desperately trying to distract the rest of him from the real reality by diverting to platitudes and narratives. And yet his job requires him to play NFL QB in NFL games against other NFL teams with players not nearly as screwed up in the head as he is, and the result is... what we see in Denver every week.