I think the key is fit. We have no shortage of guys who can play on the wing, and play well.
Clearly, playing time was Lee's primary motivation for leaving, or he wouldn't have gone the mid-major route. He has a chance to start and be one of their top usage players. We didn't kick him out. He decided to leave.
Zens is barely behind where Lee was in their respective final rankings. (like 4 spots?) Zens is a much more versatile player, in that he has a low post game, so he is likely able to play small ball 4 or out on the wing. Brown is a shooter, plain and simple, but that skill is essential for our offense to function properly.
Lee wouldn't have been able to give us minutes at the 4, and would have to earn his respect from the arc. I'm not sure shooting from range is going to be his calling card... but his wasn't even about that. It was about what Brandon wanted. He didn't want 5-10 mpg. He wants 20-30.