Dorian has no chance!!! He has the better calves, and that's it. Ronnie got him on any other muscle group. 
Dorian is one of the most overrated BBs of all time. Except the back there is nothing, ABSOLUTELY NOTHING special about his physique. 
A guy doesen't need to have several great bodyparts to be Mr.Olympia; all he needs are one or two "unfuckingbelievable" bodyparts, merely "outstanding" bodyparts everywhere else and no more than one or two liabilities. This is the case with Dorian. His back and calves were outstanding. Conversely, his pecs, delts, quads hams, traps and forearms were merely outstnading. His liability were biceps, and that's it.
No bodybuilder has more than one or two "unfuckingbelievable" bodyparts. Arnold, for instance, had pecs and biceps; at everything else, he was merely outstanding. Ronnie has one "unfuckingbelievable" bodyparts, back, and his other muscles were merely excellent. His liabilites were calves.
What makes a bodybuilder become a standard-bearer are a structure as close to perfect as possible with no muscular liabilites and a few major strenghs. When a bodybuilder is complete - which is more or less the case for every Mr.Olympia -, all he needs are a few truly fantastic bodyparts to win. Case closed.

SUCKMYMUSCLE