That's my point. Hence the: "I struggle to come up with possible acquisitions well suited to help them expand the types of games they make."
With that said, they have collaborated with most of those devs.
they wouldn't be collaborating with these companies if they didn't offer something Sony wanted.
i also disagree with your list. The ship has sailed for both HouseMarque and SuperMassive. If Sony wanted them it would have happened by now. I would argue Clap Hanz too. If Sony hasn't incorporated them into their own studios by now it aint happening.
Also both Quantic Dreams and FromSoftware are not unlikely, they are straight up not going to happen/ impossible. Quantic Dreams already has some shares bought up by a Chinese company and FromSoftware is not even independent, they belong to a big media conglomerate.
Bungie and HelloGames wont happen since their involvement for both was just marketing, and not actual game making which is what Sony does first before studio acquisitions.
Of course anything could happen I suppose.