Loved when I saw that. There always can be the "well, wait till someone's up against all NFL guys" and he's showing already he is the real deal.
I heard a great interview (I think with CMC) explaining how two years ago David was using raw skill (due to o-line play not as good) whereas last year used more combo of blocking/his skills. I'm sure as he continues to get coached and has NFL line in front of him, will only continue to refine when to use skill vs scheme to make the best plays.
But yeah...if he can show glimpses like that clip above, he'll be on highlight reels throwing defenders or trucking over them.