Hmmm, FLex won his first 4 pro shows and placed 2nd in his first O, whereas KL couldn't match that, the closest in his rookie yr was 2nd at the O. Nobody has done what Flex has done in his rookie yr. Plus nobody has won 4 Arnold classics ( you could argue he deserved the 95 and 96 Arnold's as well)
As far as both of their backs, Flex was not wide, but had one of the most detailed backs of all time. Kev had a wide back but he lacked the depth of detail that Flex had, like Ke was missing chunks of meat back there.
Flex's arms were damn nearly a perfect circle, Kev had a imbalance with having overly large Tris, but no biceps peak. Flex's quads were double striated, but Kev had him on leg size.