Sergio had muscle insertion points right at the joint in every muscle group. He was actually the perfect Mesomorph.
His thickness is still unrivaled today, all things considered.
The only guys that really come close to being complete Meso's right off the top of my head are Flex Lewis, Lee Priest and Dorian Yates.
No, not Jay, not Ronnie... you have to understand "structure" ~ Jay actually has some Endomorphic traits and Ronnie has some Ectomorphic traits. Not saying they were not predominantly Meso's ~ what I *am* saying is that Sergio, Flex Lewis and Lee are as close as you can get to pure Meso's.
Dig into the past and I'll throw Mike Mentzer in there....
I know, I know, this opinion of mine could be debated for days. I would have to be WAAAAAAY more specific to keep peeps from getting all butt-hurt over their favorites.
All Pro BB's have highly predominant Meso qualities.... but that's not the point I am trying to relay. Yeah? Otay....