Basketball is game of read and react. Read and react. If your mind is going 1000 MPH you are NOT reading and reacting, you're lost in your head you are lost in thought. This is the problem (among others) with Ben and Willie.
And to degree that you possess physicality you have to use it! This means drawing contact, initiating contact, moving at change of pace, throwing your opponent off balance. Willie and Ben do NONE of this. They are lost in their head, partly due perhaps to the complexity of the Joerger system. This is not an excuse as they've had enough time to acclimate themselves to the multiple variants of the same play.
Their respective struggles are partly about about instincts for the game, feel for the game, where to be, when to be there, sense of anticipation. These are skills that can be scouted BEFORE you commit to a player and draft them. Both in the case of Willie and Ben their feel and intuition for the game was highly questionable at Kansas and Kentucky respectively.
Is intuition and feel something you can teach? Not really!
This was one of the risks Vlade and previous GM made when selecting these prospective busts in a long line of proven busts, that their athletics gifts would make up for what they lacked in other areas. Sometimes it clicks and sometimes it don't click. For both these guys it ain't clicking, and at some point, like now, it comes time to watch for an extended period (5 games minimum) and start logging DNP-CD while other dudes waiting in the wings (Malachi and Skal) are given their chance to shine.