He covered the Slot/RB well, it was the big TE he had problems with. I am guessing that he underestimated his speed. But he's still a young'un yet and fighting off blocks, tackling RBs and sacking QBs is what we need from him anyway.
I thought he did well 2 of the 3 against the TE who looked very good, not sure who he is. And on the first I thought the TE pushed off to get separation. But both were using their hands so doubt thats called either way in a game.