Or Daniel Cormier more recently, who is the average height of LWs yet it's obvious he is not LW sized.
There is a lot of meme with Sean Sherk. Yes, he was very bulked up as a WW when used to weight 180+lbs, then shed a bit but was still cutting from 170-175lbs to make LW.
Could he slim down even more and make the cut to FW? It's possible.
Now, to say he is a "natural BW" and imagine that he would be an slender, slim 135lber is pure fantasy and has not basis whatsoever.
Most recently, Michel Prazeres who is the same height than Sherk was fighting at LW and vs Shavkat at WW. Because some guys just have wide, stocky body types, and Sherk was one of them. You would not see him as a slender, slim BW with or without USADA. That's just not him. It's a fantasy.
Here he speaks about how tough it was for him to make 155lbs:
In his quest to return to the top of the lightweight division, former champion Sean Sherk will meet Frankie Edgar in a pivotal main card bout at UFC 98 “Evans vs. Machida” this Saturday
www.sherdog.com