I'm not so sure, look at Cerrone, .... in real life he's lean and mean, wire-y type guy.
The picture I saw of him, he had body-builder style pecs.
The first undisputed game did full body scans and used them for the original fighters including the bottoms of their feet!
edit to add to that, look at Donald's picture in the OS thread, right below him is Eaton and it looks like the exact same upper torso model.