This Thornton has been an underachiever, but i can see why they're bringing him with Jamie Collins, former team mate here.
Changing our D with guys like Easley and M. Brown, is going to require guys with explosion and strength to keep up Dline rotations. Don't have a 1st [goodell's an *******, and can't keep getting lucky with those low picks, so we need to hit on some projects.
I've looked this thornton guy up and, despite flaws, he's supposed to be quick twitch explosive and also very strong upper body to take on doubles.
Stash him on the PS, get his head on straight with old team mate and maybe make lemonade out of the lemon.