I knew that running pic of Arnold would pop up, it's the 1 used in evey thread saying he is skinny naturally. Yea he did look noticeably thinner for him he dropped alot of size at one point in the 70's but he was still bigger than average and his arms were still big. That shot of him flexing his arm against the diver is off the sauce and is much larger.
These two he was off, posing in 76 or maybe 77 way after his stopped competing until 1980.
It's hard to tell what Arnold would look like had he never touched a weight, his early pics before steroids show good stucture and muscle shape, peaked bi's to begin with. But he started training just a boy and has done different routines, dropped size and put it on for different roles throughout his career. If he'd started training at 25 we'd have a good idea what he'd look like, he hadn't even reached full height when he started.
Why don't you post natural pics of Arnold then. His arms hardly dwarfed anybody's when he was off the sauce. He was downright skinny when he wasn't competing or on the drugs. There a few pictures that show this.