I'm not sure that if he stayed at his original weight it would help him with his struggles in the running game. When he takes a blocker one on one he's fine but trying to control two lineman is too much for him right now.
Where the extra weight might have affected him slightly, and I mean slightly, is rushing the passer. He's pressured the QB when he goes one on one but has been a step late. His pure strength is incredible to watch as he is walking lineman back in the pocket 5-6 yds.
He needs to just learn how to use his hands to get off those lineman. He flashes that from time to time but he's not nearly as consistent doing it. He can make an immediate impact in the nickel pass rush if he continually disrupts the middle of the pocket like he's done in preseason. Every team we faced in preseason started out blocking him one on one and then by the end of the game they doubled him.