This looks more like mimicing the Keiretsu practices of the past where these smaller share buys are an expression of a deeper biz relationship rather than the relationship itself like in the west.
The only big company that could integrate Kadokawa is Sony. Kadokawa gaming studios are only a small portion of it, they also have Manga publishing and real estate.
Kadokawa recently hinted interest in being acquired but as a whole and Sony wants only the gaming part (dunno why, with Crunchyroll and the big insurance dept they could integrate Kadokawa, I guess they are apprehensive because of the Bungie burn).
Sony already owns a small percentage of Kadokawa and a small percentage of FromSoftware.
I'd love to get a new Ridge Racer that would remake all the content from all the previous entries in the series, including ALL circuits -including mirror and reverse variants-, cars, teams, game modes (loved the career one from Rage Racer) and music tracks and would add a few new circuits, songs, cars plus features like deep car customization and online multiplayer with a ranked system.
Not counting the ones with Chinese or Korean companies, Sony made in recent times strategic partnership with Kadokawa+CyGames, Koei Tecmo+Akatsuki, now Bandai Namco. Next ones in the list could be Capcom, Square Enix, Konami and Sega.
I personally would love to see a Sega+Sumo Digital codeveloped Wipeout with more Japanese and anime vibes (launched almost at the same time than an a related epic shonen anime adaptation).