Dorian's back may be the best ever during his later years, but I'm comparing Ronnie to Dorian in 93 (arguably his best year). Even you cannot deny Dorian's back did not reach its full potential yet. These pics show Ronnie's back was just as wide and thicker. Ronnie's traps, rear delts, teres major/minor, lats, and erector spinae all jump out at you. Dorian's lower back is more striated but appears flatter. Since you claimed before striations aren't mentioned in the judging criteria so they don't matter, I guess Dorian's lower back striations don't help him.
Ronnie also doesn't have asymmetry problems like Dorian. Dorian's traps don't even line up and his Christmas tree looks like someone trimmed it wrong on the right side. Symmetry is one of the criteria the judges look for. Dorian's asymmetry would hurt him. If you want to bring up Ronnie's calves, then I raise you Dorian's arms and hamstrings.
Dorian's back was up to its full potential by 93 bu 97 it was wider but it didn't look as great in my opinion , you cannot say Ronnie's back is just as wide it may be but for you to claim it is isn't 100% accurate . and again we are deadlocked I wholeheartedly disagree with your claim Ronnie's traps are thicker , or his lats and erector spinae , and we can throw away the striations , Dorian's back is thicker , his lats from the front are clearly thicker and have better sweep .
And you're mistaken on thinking symmetry means right/left exactness in the bodybuilding context , it doesn't it refers to balance & proportion , two areas which Ronnie can't hold a candle to Dorian on balance & proportion . Ronnie's lower balance is off due to quads to big and calves to small , his forearms are not in proportion with his massive biceps/triceps , his delts in the rear double bicep shot are actually smaller than his biceps/triceps , his glutes stick out past his hips , overall his balance can't match Dorian and thats why he looks better in most of the mandatory poses . and take a good look at Ronnie's calves if you want to talk about asymmetry both don't match each other and Ronnie's right front delt doesn't match his left , most likely due to being right handed and stronger in one arm .