Here's an example of the difference between Rasho and Nazr .. and this isn't even about D.
Last night, the play was called for an ISO for Tony at the top. Tony spent several seconds of the shot clock waving Nazr out of the center lane so he could drive. Tony was becoming more and more frustrated as Nazr would move but still be in the wrong space.
In the second half, same play was called with Rasho in the game instead of Nazr. Not only was Rasho out of Tony's way, he boxed out the Bucks player from the lane and Tony had a clear path to the basket.