What has Butch demonstrated in his career that would lead you to conclude that he will succeed with all his own players? Has he ever been at a school more than 3 years?
And since we don't count the first class of a coach (for some reason, it appears that all the excusavols have decided this is now the case, though it makes little sense to me), then I guess he only signed two classes at Central Michigan and Cincinnati, and anyone other than the freshmen and sophomores he had his last year at those schools were another coach's players.