I saw 3 plays out of several plays where he dropped a shoulder the rest were jukes, runs out of bounds w/o finish or leg tackles as he ran by. Don't get me wrong it's all fine and well, but in the NFL moreso than college he'll make more impact if he learns to get low and run behind his pads from time to time. I agree Mafah has some speed.
Skip to 3:15 and beyond, Javonte will show you what I'm talking about. He gets low, gets behind his pads and plows thru. Mafah is a different type runner, I get that, but as a change up he should do like Javonte more than he does, it's not a major thing.