a 220 lbs Ronnie had bigger arms than a 275 lbs Dorian. I don't see your point. 
The point is, the biceps have less of a visual impact when the two are standing side by side perfroming either a rear lat spread OR a back double biceps. The size difference in the trapezius is striking in these two mandatory poses. Yates' has a back you could lose your hand in. Every inch of the Grand Canyon is striated, quality mass.
By your own admission, Yates takes the side triceps, few sane people would dispute Yates' glaring superiority in the Abs/thighs, and now Coleman has been trumped in the back department because of his strikingly smaller trapezius Yates is clearly superior! The only pose in which Ronnie can effectively bring his biceps to bear is the most muscular, where he hunches over hiding his stomach, but Yates still takes the majority of the mandatories.