I like that he is making plays against the run as well as rushing the passer. He is developing quickly and seems to be a more complete DE than Armstrong. Let's hope he continues to show progress.
Like everyone else, I think he does need to watch the rough stuff. That body slam looked like a penalty although I cannot find the rule in the rulebook that covers it. I found the rule that says you cannot body slam a Quarterback, but I don't see about other runners. Maybe I missed it.
Update: Actually it is not specifically mentioned but two sentences appear to cover it:
1) Note: When in question about a roughness call or potentially dangerous tactics, the covering official(s) should always call unnecessary roughness.
2) A runner already in the grasp of a tackler and whose forward progress has been stopped. (is defenseless)