I'm not saying that he is definitively on PEDs, but this is what they often say when guys test positive. Not to speak ill of the dead, but if you were to look at the old board, there were plenty of posts that Kudhukov (and before him Leipold) were just great technicians and didn't rely on strength to win... just great technique.
Guess what? Technique is a lot easier to hit and looks a lot smoother when you are juiced to the gills.