Jason's biggest mistake was benching Brandon Weeden(made worse with the release) if the coach had a backbone then he would've admitted he made a mistake and put Weeden back in as the starter.
By the end of the Seahawk game it was clear that Cassel was complete garbage.
Weeden had performed better than solid but had been a hard luck loser because the defense and overall discipline wasn't there the first 6 games or so, then NE came to town and their coaching staff totally dismantled ours. Garrett made Weeden the scapegoat for that and thus our season died right there.
The bleeped up thing about is our defense has become one of the better defenses in the league, but our offense had become down right dreadful with Cassel at QB.
I think we would've been right in the race had we not panicked and benched Weeden; then the idiotic release after it was clear that Cassel was trash. Maybe the worst QB performance I've seen in team history. He's actually playing with talent around him, Ryan Leaf and the scrubs between Aikman and Romo weren't.