A little too pessimistic given that you don't have his knowledge. Easy to say he had the genetics but the fact is that superior training, intensity and nutrition brought him up from 157 lb.
lol come on now pumpster...
this stuff isnt rocket science...its not like he did some kind of 'secret exercise of the pros' that got his arms big...there are only so many ways to train your biceps. alos i dont train any less hard or smart than these guys. the difference is their glorious genetics and the fact that they use anabolic steroids. thats it.
he is always considered to have shitty genetics but that is far from true. he may not have been a big guy but look at his arms. completely full muscle bellies and low insertions on the bis, tris, and forearms. most people only have maybe one or 2 of those, two if their really lucky. i have small joints, long lanky arms, high bicep inserts, and unimpressive forearms. doesnt mean i train any 'less hard' than him or have 'less smarts' than him
it just means he has superior genetics. and drugs.