I'm sure you're smart enough to understand the difference between discussing who is better at their best vs. who maintained their best look for more years but your posts seem to prove me wrong 
He was still improving, wasn't at his best.
Levrone has 4 2nd place Mr Olympia finishes to Nasser's 1...and a better average finish
Levrone has more grand prix victories...and a better average finish
Levrone has more Arnold classic victories....and a better average finish
Head to head Levrone bested him regularly
No matter how you slice it... Levrone was better.
and your argument is ...'yeah but when Nasser was better, he was REALLY, REALLY better"

you guys are fucking brainwashed...it's retarded