I think from a health standpoint Bender is the biggest risk in the lottery. He's a 7 footer who's never played above 216 lbs. His build is similar to a young Kevin Durant (who's already lost an NBA season to a broken foot) in that they both have extremely narrow shoulders. Durant had to add almost 30 lbs after entering the NBA just to play mostly on the perimeter. Coincidentally, both players weighed in at 216 lbs at their pre draft workouts. Even if Bender adds just 25 lbs to play in the NBA does anyone feel confident he'll be able to carry that weight safely over the course of an NBA season? Bender's brother - who is his closest genetic match and who did play reasonable minutes in a professional league has torn his ACL... Twice.
Unlike any of the college prospects, we have no idea how Bender will hold up physically over the course of a season since he's only played a few minutes a game. You can fall in love with his potential, but the single most important quality of any professional athlete is health - ie the ability to play big minutes and play them over an 82 game schedule plus playoff games.