He's trying his best. Maybe the mitt holder should move at fight seed or try to out maneuver him instead of only feeding him what he can handle.
Idk, I'm only spit balling. Maybe this is what Mr.5000 needs right now, but it seems like it's a little late in camp to be doing slow technical work. Broadly speaking, he's working on the things he sucks at. That's good in the long term, but you don't get any real short term benefit unless it's an easy fix kind of situation.