Trev Alberts said it in his opening press conference and repeated it in his press conference on Sunday "One person does not define the Nebraska football/athletic program."
I don't think Trev was referring to anyone in particular, but it's an interesting quote which he keeps coming back to. I think at times, Tom Osborne may have thought he was bigger than the program (naming his successor, rather than letting the AD do it) , and I think there were times where Frost was enabled to think he was bigger than the football program (starting with the concessions made to Frost to bring him to NU).