No It isn't, it is the business. at this point Block the interview. That is the Business, they do it for players, then do it for coaches.
So Tenn you want to talk to Butler it is a 4th round pick to talk to him.
An Assistant coach is just as much of an asset as players. Cant talk to players under contract unless authorized by the team, same goes with Coaches (except for HC obviously), but hey Tenn you want to talk to him fine we will take a draft pick to grant the interview.