they had a 'deal' with TNA before, and it lead to them doing ... nothing with Okada. Japanese wrestlers don't get a push in the states. Europeans barely do. Mexican wrestlers get more than Japanese but less than European.
I would argue since the mid 90s that Mexican wrestlers have been pushed more than European guys in America. Eddie, Rey, Chavo, ADR, multiple Mexican/Hispanic stables in TNA. How many European world champions, or title holders in general have there been in WWE/WCW/ECW/TNA in the past 10-15 years?
Sheamus is the only world champion I can think of and the way the relationship between the UK and Europe proper makes that kind of borderline case. In fact, nearly all European wrestlers in the big leagues are from the UK exclusively. Besides Claudio, I really don't know of any non-UK Euros that have made it to the bigger companies in the US. If you go back farther you get...Ludvig Borga, Andre, and Bruno, I guess. But even then, of all the big UK wrestlers that have been over here, Sheamus is the only world champion. I would say Regal is the most known and successful guy of the whole group, but after that the success rate really drops off to meaningless midcard titles and under.
Where as Rey has been one of the faces of the biggest company of the decade, had a (shitty, but still) title run with the big belt, made the the cruiser and tag belts mean something, and is always a major star and focal point when he's not hurt. That goes without mentioning what he did in WCW. ADR debuted straight at the top and has been in the main event since his very first night, headlined many PPVs both as champion and challenger, won a Royal Rumble, is on as much or more promotional materials than Punk. Eddie was arguably the most over guy in the world from the end of 2003 until his final heel turn and death. And even then he was still one of the most popular guy in the company. And now he's been outright deified since his death. This also doesn't take into account his ECW and WCW work.
Then you have lesser guys like Chavo, Juvi, Psychosis, Super Crazy, Sin Cara (ish) who, while they weren't pushed as top guys, had long successful careers in the US where they were featured players and had time to have long matches on TV and PPV.
TNA has been pushing Hernadez hard for 6 years, Chavo is now there being treated as a bigger deal than he ever was in WWE (clean win over Kurt!), had a working relationship with AAA for about half the duration of company history. The only UK/Euro guys TNA has/had are Bigger Robbie, Doug Williams, and Brutus. Doug Williams gets submission injured by Zema Ion and Bigger Robbie wears tiny cardigans (which is actually awesome).
Mexican wrestlers have been given way more in America for close to 20 years now.