Tom was in place when this hire was announced. The hire was made in mid October, by a big money deal, in part paying the buyouts of both Peterson and Callahan. Tom was brought in to settle the fan base. This was not Tom's choice, just like the firing of Bo. Money made the decision that he had to go, not wins or losses, but state of the program, the image of Nebraska.
All of this same stuff happened before Pelini left the first time, Dillard, Bullocks brothers(the kids did nothing wrong) were all involved with Bo and his continuous actions to undermine Callahan for months after he was gone. Came very close to NCAA infractions, I was told then.
That is why I was so shocked he was hired, and tagged to Coach Osborne. Callahan was to much of nice/smart guy to go after Bo. He knew the fans love for him. Would only make things worse for his program (opinions of people in the program at the time). Tom was aware of these things and wanted to go a different way, but his choice turned him down.
Alas 7 years of the same crap he was doing after he was notified the first time he left. He was poison then and pretty much the same now.