I figure I could follow that up with reasons for why you are wrong, but would that really get us anywhere. I just figured I'd skip past the logical stage of the discussion and get to the pissing match that would eventually follow.
I think he's just slow and has trouble adjusting to shifty forwards carrying speed. It's not premeditated or intentional, it's just a function of his lack of agility. Whereas a guy like Weber can still get a shoulder into a darting forward, Witt just doesn't always have what it takes to move himself in the way properly and just has a knee-jerk reaction that ends up as trouble.
True, out of the small time I've seen him... never really seems like he tries to check anyone. He pretty much just tries to stay in front of the player.