Jays back is not on par with Ronnie's there. But to say jays 2006 back is not in the top 20 greatest backs is laughable. plain hating. He weighs 270 lbs. The sheer size of his back puts him in the running. Couple that with good detail.. Not amazing, good. Massive size. Extreme thickness. That is a very thick back. And good condition ( his lower back is dry he has a cosmetic fault with the skin) and you have one of the best backs ever. Not the greatest one of the best. Flex wheelers back was ultra detailed. It was also extremely narrow. So jay not having extreme detail of guys weighing 70 lbs less than him is a minnor fault. His detail is plenty good. Top 10 ? Maybe not. Top 20? Of course.
It is not hard to be ultra detailed at sub 230 lb bodyweight. Nevermind 188 or 205

You could argue the greats like Samir, Flex and Shawn where undersized. You could combat the detail accusations against Jay with the same principle. Doz and Ronnie had ultra detailed backs at over 250... Flex and co where just to small to compete. it is all relative. The back jay brought was one of the top 20 ever.