I would agree to some extent about the rumors b fold, except this was in the original H.I.T. faq, that was merely posted on cyberpump.
I'm pretty sure Kevin Tolbert was natural...just an absolute genetic freak. I could be wrong, however. If you look at a picture of him he looks enormous, yet it almost suits him like a normal person. He doesn't look like he was just jacked up with drugs, in other words. I'm not sure this counts for much, but also as Dr. Ken's son he would probably share the same opposition to drug use.