I think you nailed it on this one Salsa. I think being big and muscular would actually "hurt" a golfer. Sure distance off the tee is one possible advantage, but other than that, the game relies on touch, finesse and mental toughness.
The only way PED's would help him like you said, was to help him recoup from an injury faster.
BTW, just so everyone's clear, this relationship between Tiger and this Doctor is SO FAR, just an in-direct relationship and nothing more. No accusations or incriminating facts have been released.
Like being attacked with a golf club?