Sorry, but your entire post lost all credibility when you claimed someone didn't understand basketball, yet you said he sets good screens. Quite ironic. Fermin is one of the worst bigs I've ever seen at setting a proper screen. Quite frankly and no exaggeration, I don't believe I've ever seen him set a good one. It's like he's either learned nothing about that aspect in the 3 years he's been here or he wasn't taught, or they even gave up on him learning how to do it properly. It also seems like he's not too fond of the contact that screens bring. Now I will say he will get a good seal from time to time near the basket that results in an easy bucket for someone, but setting on the ball screens??? Atrocious.
All he ever does is show and slip, thinking he's going to get the ball like he's an offensive juggernaut (they never pass him the ball, and rightfully so b/c he'd likely drop the pass anyway) and it rarely results in a open shot for anyone in our set when he does it. Compare that to Luke when he sets screens and you will understand the advantage that screening on the ball properly gives to the possession.