It certainly could be a number of things. I think this area may be a legit difference in philosophy, at least as it pertains to early season floor time. That may have something to do with Hubert's NBA experience. Your difference makers, are going to be on the court?
10 deep, as some earlier hoped for, is difficult to do in the NBA with minutes. That is with 48 minute games, 3 games in 4 nights type scenarios, etc
They are expected to be ready on the bench, but you ride with your difference makers. His 8 may change, you can work into it, but I think he wants a core 8 as it relates to rotation.