Maybe it's me, but I'm just not convinced Jadaveon Clowney is a "sure thing." It's not just the supposed effort thing; it's not just the 'poor hand technique' rap ... it's just ... I don't know. It could be he's going to tear it up in the NFL. Or it could be the level of play in the NFL will make him merely 'good' rather than 'great.'And I'm even further unconvinced that Johnny Manziel is a sure thing.