Why do people think Mueller doesn't have a shot at getting drafted? And why are people so sure Lockett does?
Mueller's size (like Michael Sam) will cost him in the draft.
Lockett is small, but he'll get drafted. He's too talented not to get a shot, though injury problems could hurt him (like Zim).
You're probably underselling Lockett here. Based on physical gifts/skills alone, he's a first-round talent. The only thing you can ding him on is weight/frame, but the dude from Colorado (6-0, 175) went No. 45 overall and he had a worse injury history, worse ball skills, worse everything pretty much.
But I guess you never know what teams will do.