That's the discussion and data I wanted when I asked the questions. Given that Henry is a 1st and 2nd-down back, not a pass-receiving threat, his NFL draft status will be down the list a bit. That's been the pattern of the draft lately; RBs are drafted later than skill guys, DBs, and QBs.
I think RBs have been mostly drafted lower because their NFL careers are usually shorter-lived than the other positions.
Exceptional RBs still have a chance to go in the first round, especially if they're the complete package.
I think Henry could go in the late first round or early second round. He's durable enough to withstand NFL pounding. To be successful he will need a good OLine and a team that is dedicated to running the ball, not a team where running is an afterthought. He doesn't have the footwork to avoid defenders in the backfield or to make defenders miss in space.