In short, yeah. Imagine if they so hawkishly signed Russian and Central Asian talent like they do US/Latin American/British/Brazilian talent...Firstly there'd be way more wrestlers in the UFC and guys getting drug all around the mats and dominated far more often. From an entertainment perspective they don't want that. They like having some Russians to fill the Muslim niche but there's about 25 male Russians in the UFC entirely and well, clearly compared to 100 Brazilians that's not a lot, is it? Definitely intentional too because there's loads of talent out of Russia. We've seen them tell Eduard Vartanyan if he wants a contract to go on the contender series (Vart just won a 1m dollar ACA tournament), they turned down Alexandr Shabliy so he went to Bellator, they turned down 16-0 Flyweight champ Azamat Kerefov so he went back to ACA..there's a long list. Realistically while these guys fill a niche, they can't have saturation as PPV markets and high paying TV deals are all Western Audience based too.
If you ever wondered why Bellator/PFL can sign so many elite Caucasian prospects it's because the UFC just doesn't really want them. Where when they want guys that are US talents they gotta sign them super early guys like McKee, Archie Colgan, Aaron Pico, Novenyi Jr, Dalton Rosta etc. Guys like that they have to sign straight out of the amateurs or only a couple fights into their pro careers and then pay to keep them because the UFC will sign them.
Watch the contender series this year, I hope I'm wrong but Renat Khavalov, Khuseyn Shaykhaev, Yryskeldi Duysheev, Razhabali Shaydullaev, Khalim Nazruloev, Asaf Chopurov, Bakhtovar Yunusov are like my top prospects for Bantamweights out of Russia and Central Asia. Will any of them be on the contender series? Surely a bunch of fireworks less skilled and accomplished guys from their key demographics Will be, but I'd bet maybe 1 of these 7 dudes, when in reality they're all must signs and all 26 or younger. I think Shaydullaev already got picked up by Rizin but they often let their guys get signed by the UFC. Yryskeldi I think had a 1 fight deal with ONE, but they're for sure letting other countries nab up elite talent because it's from the wrong countries.
The visa issues are another factor too of course to be fair. But it's a shit situation.