You don't need supraphysiological amounts of hormones to build very high levels of LBM.
and, Stimulus=Weightlifting
I am going to reword my opinion, so it doesn't seem so vague. Basically, what I should of said was,
any natural weightlifter without a hormone deifiency or overly ectomorphic bodytype, can attain as much LBM as an anabolic using pro in his competition-state (3%-5% bf).
The big difference
The anabolic using pro will have that incredible amount of LBM at a very low bodyfat, whereas the natural will have to look like the marshmellow man, to maintain it.
The one thing I do agree on is that a natural lifter can never obtain as much LBM as a lifter on anabolic aids, if both their goals involve becoming behemoths (meaning the roider doesn't care about bf% either).
A good example would be, seasoned natural powerlifters. There's plenty of natural powerlifters that have been in the iron game for 20+ years, that hover around the 300lbs-375lbs mark.
You might not be able to visibly see their musculature as well as a bodybuilders, but it is there.