1) they have 3 studio
2) consolidating of studio doesn't mean they won't have external development partnership
3) bolded is bullshit as we get sell through numbers
Last time I recall Team Asobi is one studio and Polyphony Digital is it's own thing and not part of Japan Studio, don't know where you are getting the 3rd studio from.
As for your second point, sure their might still be external development partnership but people look at Japan Studio and think of merely Knack, Gravity Rush, or The Last Guardian, but recently the elephant in the room when one of this forums favorite games Bloodborne was produced by Japan Studio, that being said the producer is no longer a part of the company, which is likely one the major side effects of Japan Studios contraction into a more consolidated entity. People love to cite Miyazaki and From Software as entirely the credit for Bloodborne's existence but producer Masaaki Yamagiwa being one of the main driving forces which collaborations with From Software with projects such as both Bloodborne and Déraciné for its development, which puts projects such as a potential Bloodborne 2 coming to fruition in a questionable light.
As for claiming what I'm saying is bullshit. I merely pointing out the fact that there IS a distinction between consoles being shipped and being sold through. Especially with the scarcity of PS5s in the wild and it's current demand, which goes back to my point, Japan buying PS5's is all well and good, this goes back to the nature of this thread of studio acquisitions, especially so for Japanese developers making games that target a Japanese market, something Sony recently decided they don't necessarily need outside of 3rd party relations since they are mainly focusing on the strengths of their Western output, which is why I brought up the point of putting ones egg's in a single basket. The consolidation of Japanese studios means they have even less resources to divert to for the purpose of external partnership, as example my case for Bloodborne and Déraciné, which with latest trend of folks continuously bringing up the failures of Gravity Rush, etc, I'd say it's something being very much glossed over or ignored.