Callahan has an amazing way of completely ruining talent.
He recruits wonderfully, but can't do a damn thing with it.
Solich on the other hand couldn't recruit, but won a lot of games. (In the year he was fired, Nebraska won ten games. Callahan has yet to win ten, despite the addition of an extra noncon game, and the Big XII north being infinitely weaker than when Solich was coaching.)
Which is the better choice?
