He had the fastest 10 yard split time as well which is an indication of his burst and recovery speed.
Adding muscle the right way will actually improve his speed, burst, acceleraction, quickness, what have you. Especially on a 6-2 man who is only 182. He has plenty of room to add muscle without ruining his attributes.
Hall is 197 @ 5-10, Pacman Jones is 185 @ 5-10. Two of the fastest and quickest CB's in the league. Neither one has issues with speed or quickness and they are bulkier then the 6-2 182 lb DRC. He can add weight and keep his attributes without a doubt.
Watch Pacman run. Looks like his huge head takes up 40 lbs of that 185 and we know that's not possible because his head is empty.