Ultimo Dragon was recently a guest on the Perched On The Top Rope podcast, where he discussed (through his translator Sonny Onoo) Rey Mysterio getting pushed in WWE instead of him.

"So when I was with [WWE], Rey Mysterio was there, of course. The way they look at it, they're similar characters, both masked guys, smaller, cruiserweight, but I didn't understand at the time. That's true, but I didn't realize it till afterward. They wanted me to take my mask off. That was one of the reasons why I left.”

“Rey Mysterio was really popular. So, as a masked man, there was really no spot for me. I am a promoter as well, so I understand a lot more now. Of course [he would have liked to compete more in WWE], but I'm a promoter now and if I had the choice between Ultimo Dragon and Rey Mysterio, I would choose Rey Mysterio.”

Dragon also stated that he never had a real conversation with Vince McMahon or Triple H, and only merely said "hello" to them in passing.