Ronnie has a short torso which makes him appear even thicker than he is in the upper body. This is a good thing for bodybuilding genetics. Also, genetically, he does have a narrow waistline, genetically. Also, he has thick pecs (when flexed correctly), great round shoulders, huge thighs and huge lats and traps. All of these things combined give him this incredibly impressive "X" shape. With the right conditioning, and controlling his stomach, Ronnie is definately a deserving champ and does have great genetics. But, of course, he isn't perfect- his abs for one thing. But, what great Mr. O was known for great abs? Dorian, Arnold etc. all had short torsos which gave them the four pack as oposed to the traditionally accepted 6 pack. Just goes to show the advantage that a shorter torso gives.
I do think Jay at his best should beat Ronnie when Ronnie is off. But, structurally, Ronnie does have the advantage. Jay is a large dude who more than pays his dues. Ronnie is a genetic superior (as is Jay in different ways) who also works very hard, but has flaws: sometimes in conditioning, posing, and a few genetically. But, that's the "sport" of bodybuilding: you hope and plan that you come in at your best and your competition doesn't.
J.