Yeah he jumped off the tape. Rewatched the end of WFT and Bears Preseason 1st half to isolate on Brown. His technique in the former was noticeably better than the latter. But what he does that's special to me is, gets the initial block, but as the play moves his way, if his guy disengages and pursues the play Brown will follow and re-engage... usually violently, as if to say, "When I block you, stay blocked. Or else."
Brown is elite traitwise, a dancing bear. As they used to say about Munoz, built like a B52 and moves like Baryshnikov. Add in the attitude of a badger, until the whistle blows if he can reach you he will try to bury you. If he gets his technicals squared away there's no reason for him not to become a top tackle in the league. Right now the one move that seems to get him in pass-pro on the right side is a speed-to-power rush that threatens his outside shoulder and then shifts to attack his inside (left). I haven't seen that move get him on LT reps, but on the right side it's currently effective.