You can call him a question mark as a 3rd rounder .....
He's a question mark in August of 2014 but that's not cause for alarm
Your buddy Big Ern was undrafted because he did not possess some/any traits of a very good OL. He's a dime a dozen. He eventually became serviceable, but that's proof that the draft guys got one right - you don't invest a draft pick in a guy with a low ceiling.
You invest them in guys with a high one and Thornton's ceiling is much higher than fans surmise in August of 2014.
Big guys who can move are harder to find than lardasses who just can't.
Thornton can move and that's one of the reasons team(s) liked him.
This is my concern. When you look at a guy because he has the right dimensions and a supposed quick twitch but generally plays like he's completely lost, which seems to be the take on his college days as well, you might as well be investing in a workout warrior with a 3rd round pick at a position needing an infusion.
People comparing Jennings and Collins is ridiculous. All those guys did is have incredibly solid college careers. Thornton is the eternal flame of "potential".