I don't think that any of the Mr Olympias are overrated.
Dickerson was rewarded for being the best bodybuilder in the early eighties at a time when creative aesthetics were being rewarded. How then can he be underrated if he is being rewarded for what he was best at?
As for Samir it makes no difference if he failed to produce after 1983 cause the night that he won, he DID produce.
The idea that Zane was a swimmer is ridiculous. Number one, swimmers cannot be beat Mentzer and secondly, Zane was being rewarded for conditioning and classical balance. His physique was big enough to highlight those points so again, how can he be overrated for being successful at what he was good at?