I think it's a mindset thing for him. He is still relatively young at 21. I expect by 24 he will be a huge handful for other teams and crash and bang a little more.I would like to see Slaf make things difficulty physically for Washington, we really need to be pushing back
He is big and strong. The confidence that comes with that when facing men, is acquired through becoming a man yourself.
What I am saying is he is a man in body and has been for a long time. But, its possible, that he isn't quite there in mind yet. When those two things line up - that's when we will see fully formed Slaf.