I always thought that most of what happened with Crompton was Chaney. Kiffin is a good playcaller... but a coordinator? On his own, without Sark and Chaney actually being his OC? I guess we'll see what he can do with the most talent-laden roster in college football.
Chaney couldn't develop Bray in three years. What makes you believe he had the ability to turn Crompton a complete 180.
I thought the offense was honestly fine in most of that time. The playcalling was atrocious, though, and the lack of any team cohesion was apparent. I've always seen Chaney as a good Xs and Os guy but in interviews you can see how he wouldn't exactly inspire a team to play well. Chaney needed a guy like Kiffin and vice-versa. Chaney definitely couldn't draw up a competent gameplan and call plays to support it. Always gave up on the run too early which lead to a lot of desperate heaves from Bray and 2nd half mental meltdowns.