Both the EU and JP teams did work in Rise of the Ronin, here's the XDEV portion credits of the credits. Notice the position and role of Jason and Arnaud (Tim Preece is the head of XDEV Europe) and the names of the rest of the people:
I know, I already acknowledged that the European staff helped with that project.
What you're missing is the fact that it was led by Arnaud Saint-Martin, who I repeat, is the HEAD of the studio in JAPAN. The production happened at Tokyo, none of the 'normal' producers from Europe worked on it.
XDEV, a.k.a. External Development, is the PS Studios team that handles the production (and indirectly more things, but mostly the production) of their 2nd party games, the 1st party games whose lead dev studio isn't an internal Sony team. As an example, Eduardo and Tomoyo are producers and not product developers.
The "San Mateo Studio" is the SIE American HQ building they have in Foster City, where they do a lot of things other than product development.
In the same way that their Japanese team (now and when they were inside Japan Studio) are in the SIE Japanese HQ building, where Team Asobi also has their office.
Overexplaining basic concepts like a robot is not helping your point. Once again, Tomoyo was a producer on TLOU2 Remastered, which was developed by Naughty Dog, NOT by an external studio.
San Mateo Studio was always a fancy name for a specific product development department located at San Mateo (they haven't been in Foster City for over a decade, btw). Their main purpose is the produce games made by SIEA subsidiaries, like Naughty Dog, Sucker Punch and Insomniac. They also used to be the main producers of externally-developed games up until 2020 when XDEV America was established, but they continued to work on the external projects that started before this, hence them producing both Helldivers 2 and Firewall Ultra.
This is what the true XDEV America team looks like, from Concord's credits. None of these people worked on Helldivers 2 or Firewall Ultra:
And like, no fucking shit the XDEV social media account never posts about Helldivers 2. It's not their game.
Example of Eduardo Zamora's credits in production (not product development) roles, in the last 13 years he basically produced 2nd party games and Pixel Opus (an incubation team of students of around a dozen people, who worked from that San Mateo building):
Games way before XDEV America was established, read what I wrote above.
Tomoyo Kimura (ignore the Pokemon stuff, it's another person with the same name), again producer in mostly 2nd party games from Japan Studio's external development team (now XDEV Japan) and later moved to Foster City, San Mateo to continue working as producer on mostly 2nd party stuff:
It literally says that she was from the Business Development Department at Japan Studio. She then moved to localization in the US, which is why both Death Stranding and Gran Turismo 7 are there. Her first actual project was The Last of Us Part II Remastered, which you just keep ignoring that it's made by fucking Naughty Dog.
Regarding Gran Turismo 7, you'll see some XDEV Japanese team / Team Asobi / Japan Studio members who worked in a Gran Turismo or two, because in a few of the GT games Japan Studio's XDEV team did support them.
No Japan Studio team ever worked on Gran Turismo. Polyphony Digital's games have historically never had SIE producers working on them.
Then explain why these people I shown or other XDEV staff did/do work in projects that aren't from their region.
It's literally one example, and I already told you that these teams do help with each other. What is not going to happen, otherwise, is a Japanese game being produced only by XDEV Europe, with no involvement whatsoever from XDEV Japan. The only instance where such thing could happen is if they're working on a SIEE IP, but outside of that, no reason for that to ever be the case.
