There's more than bodyweight that goes into deciding who gets the trophy. All of those guys would have beaten heavier competitors.
I stand by the point that at 6' you need to be very close to 90 to look the part. 183cm and 83 kgs would look like a rake handle.
You sure? ronnie dominated because he was 295, mass has been how bodybuilding has worked since the 70s, hence why flex and levrone never won an olympia.
I'd say the guys who lost either came in smaller/lighter or not as conditioned.
Your 6' 90kg yardstick is what it takes to win state/national/world titles, it could at best be described as a genetic peak.