I wouldn't say he can "spin" - he can't. That's one of his weaknesses.
He's a tremendous "first step/hands inside" contact guy. If you single him, it better not be on a 7 step because your QB is going to get pasted. I think he's going to look absolutely sick next to Dareus in a 43, much the same as Bruce would have if he wasn't forced to play 34 most of his career, though Mario IS NOT Bruce Smith in any way. Bruce was far more agile and had better hips.