Yep, because Pop knows the preseason is all about teaching and learning, not winning and losing.
Most coaches use preseason to give players, that won't likely be part of the rotation - unless there are injuries, some run in game situations. Like what Stotts did with Connaughton last night. It gives theses players experience running the offensive and defensive sets at game speed and it lets the coaching staff see how different players and different lineups work together in game situations.
Pops extends that learning experience to his assistant coaches. It gives them the same type of game experience and it also helps build rapport between the players and assistant coaches. They will have plenty of Pop in their ears during practice and the regular season. It's probably also a good move for an assertive guy like Pop to give the players an occasional break from him. If they hear the same messages from the rest of the staff, when Pop isn't there, as they hear from Pop, it reinforces the message and keeps the players from tuning out Pops when he gets on them.
BNM