Matt, you still have so much to learn. Ronnie's size and thickness could never be doubted and he certainly outmuscles Yates but even in top shape he always has that somewhat "inflated" look and lacks the real grainy appearance. Hard no doubt, but still a little pumped up, like his muscle quality is slightly lacking even after all his years training - yes, it came together for him a time or two. Gargantuan mass aside, he looks plain wrong in the front lat due to overly long arms for his torso and his bulbous, breast-like pecs overpowering his shulders and his balloon thighs making his calves look poor. Yates had a wide waist (at times) for sure but his actual hip structure is quite narrow. Gaspari was mega hard and vascular but even he lacked the real deep cuts and detail - compare him to a vintage Al Beckles (85 for example) - especially the detail of the upper back.
Ruhl looks very good in the 99 GP pics by the way.