Jay wasn't able to market the Mr. O, neither Dorian, and Wolfe, although big and wide, his English is not the best, so your point about Dex and Kai not being able to communicate is moot.
If one were to market Bodybuilding, there were two guys that "could" have done it. Dennis Newman, because of his looks and Shawn Ray, because of his looks, his polish, dress, and "communication" skills.
Yes, but Dennis was never going to be Mr. O and nor was Shawn. With bodybuilding being such a small sect people naturally want to see the number 1 guy. Neither Ronnie, Dex or Kai can do this 'sport' any justice since they lack basic communication and interview skills. Dorian was far better but too .... boring and spoke with a monotone voice. Shawn was probably your best bet since he was up there with the very best of them, didn't have a GH gut and had a pleasing physique, and functional communication skills. Anyway, I'm sure a spokesperson can be found, the only problem would be making this 'sport' mildly interesting to watch.