Nice discussion starter, SS. I suspect that was your intent in the first place.
Your theory is dubious, however. Your evidence of Arnold´s legs is extremely thin, at best. You can´t be sure how hard he worked these muscles in relation to eachother.
Also, the post regarding the "history" of steroids. The experiments on dogs also applies to humans. that is, Chinese swimmers who were administered the drug experienced marked gains in lean tissue WITHOUT lifting weights. I´ll stop here as I frantically look for the study in which I found this.