This is legit--I remember something to this effect came out when everyone was ready to jettison Frank, as people came to the conclusion that Dr. Tom's consideration of external offers meant he stepped down in '97 for reasons other than those he gave--namely, that Dr. Tom had promised the helm of the 'Huskers to Frank, and Frank was getting itchy to coach.
Mind you, this line of thought was floating out there back in '02 and '03 as a way to blame Frank for the (then) downfall, before the program was eventually 'Callahaned'.
Don't think it's legit, but it was floating out there in the ether, FWIW.
i can't verify anything, but a key point to that rumor, which i tend to believe, is that osborne left earlier than he was ready because he wanted to do so while he still had enough pull to deliver on his promise to solich. with byrne, an outsider, coming in as the AD, we lost some of the family approach and osborne (right or wrong) wanted to keep it in the family while he could.
of course, if this is indeed true, you have to wonder where we would be if chancellor spanier had hired the NU guy, and TO's choice, for AD (papik) instead of bringing in a hot shot outsider. would TO have stayed longer? long enough to change out some of the aging coaching staff that caused solich some problems? long enough to have turner groomed for head coach if solich finally moved on? long enough to cement us further as an absolute machine of a program? ifs and nuts...