with a talented player like Clowney or a Manziel but for people like Tim Tebow or Michael Sam a lot of people pass.

Tebow had some issues but he had some success too and at the very least could be a backup somewhere even if they just use him to run the Wildcat but a lot of teams would rather not have to deal with a backup QB that may be more popular than your starter even though he's less talented because that type of thing can be a huge DISTRACTION for the team.