Candidates want to know who is hiring them, Scalley or whittingham. if Kyle stays, it potentially limits who they ultimately can get because no big time coach wants to be hired for a year and then get let go when Scalley takes over.
If Kyle stays, but Scalley is the hiring coach, that OC will not be loyal to Kyle, or be a complimentary coach to what Kyle wants. It would get ugly
A lot of big time donors see this problem and want Kylento gracefully bow out.