Didn't he know using diuretics was against the rules ?
Dorian knew, and he dieted differently and lost a little size, but still came in with his trademark conditioning, without the diuretics. (Or at least didnt get caught).
Little things that separate Champions from runner ups.

I dont know why Nasser was never able to get in condition when he got heavier, too worried about losing muscle maybe?
I personally think thats why he was never able to win the big one, he never did what it took to win, if he had came in shredded just ONCE it would have been his, unfortunatley, weather he didnt know or he was just too worried about coming in small, he never lost all the fat/water off his back. Shame really, he should have won the O in 97.
Back was just soft, and if the back is soft and watery, generally that means their condition is off, and he paid the price for it.