Historical comparisons are never exact but in many ways Carr was the tsun equivalent of Earl. Both took over the machine that Bo/Woody had created and had a good run for a while but at the end things were falling apart. Both consistently did less with some pretty remarkable talent.
Keeping that line of thinking going then, the incredibly ironic part is you could point to Cooper as the the reason why OSU was ultimately more successful than tsun post Woody/Bo. The argument can be made he was the bridge to Tressel and Urban by way of the success he (mostly) had whereas tsun has made a succession of errors and may or may not be on their way back up.
It does reinforce my belief that any moderately blue blooded football program is one good hire away from relevance. This must be true because the opposite is true; even the blue blooded program are one bad hire away from mediocrity.