None of these guys are really that big to began with. Muscular yes, but all things considered and I've been saying this forever. The majority of these guys are all under 6 feet averaging 5'6/7, that's not big at all. Levrone, Heath, cutler, all around 5'9 range.
You want to see big look at football players, most would dwarf bbers.
6'5 Peyton manning, cam newton, or Calvin Johnson would make majority of the pros looks small.