I always liked Khem Birch, i know of him for awhile, as a recruit and then I can remember seeing him at Pitt, my initial assessment was definitely 'this guy looks like an NBA player' I can remember being amazed with how well he could run.
IMO he belongs somewhere in the 40's or 50's. I can see why he declared this year, without offensive improvement next year he would have been turning 23 going into that draft, there was plenty of room for error.
I think Khem can stick, he plays defense and rebounds, serviceable FT shooter, that's a classic formula to hang around.
Best-case for him is maybe... Amir Johnson.. i think thats spot on and could happen, hes going to need to play 4 for a long career though.
I gotta say though if im looking for Defense and Rebounding in the 50's, i prefer stashing Moussa Diagne, whos got legit C size. for a team like the Knicks, Khem could be a perfect match and really outperform though, hes got a decent shot at making it as a 2nd round pick imo, I wish he showed more improvement on offense in all these years, but i guess thats why you get him in the 2nd round