The 2017 draft is loaded but if they are considered 2nd round picks, there obviously isn't much confidence right now in their prospects. I can kind of understand that with Brimah as he has no real offensive game and is so foul prone at the college level that it's very questionable whether he would have any level of defensive impact in the NBA (and he is weaker than Hasheem Thabeet who couldn't stick in the NBA as a defensive player).
Hamilton on the other hand is a much more intriguing pro prospect. They did have him at #6 at one point last year and I feel that he only needs to make a few improvements to really increasing his professional potential. I think the scouts do not like Hamilton's shooting stats on 3s or his overall FG%, but he is a better shooter than what his stats show, and improvements in strength and shot selection will soar his % on both 3s and 2s.