Crystal Dynamics seems like an easy bet for Microsoft to pick-up if this divesture takes place as they are already actively engaged with development of the Xbox first-party Perfect Dark reboot. I would also look into Eidos Montreal, but only if they came attached with the Deus Ex IP. A sequel to Mankind Divided or a new open-world entry in the franchise would be a killer exclusive for any company.
Agreed esp over Gearbox. They come with IP's that are actually worth acquiring. With Gearbox, their biggest IP is Borderlands, which Take-Two already has partial ownership of, so Xbox wouldn't be getting any exclusive or even multiplat but day one Gamepass Borderlands games from the deal, so the only IP they would get would be Duke Nukem (dead and pretty much unrevivable without losing it's identity as a franchise, because even in 2011 people found Duke offensive, and they'd find him even more offensive now in the 2020's), Brothers in Arms (dead, was never particularly popular to begin with, as the biggest game in the series only sold like 2m copies), Homeworld (fairly niche RTS series), and Battleborn (dead and flopped the first time around).
Crystal and Eidos, in addition to already assisting on Xbox 1st party games, come with two relevant, fairly popular IP's in Tomb Raider and Deus Ex, as well as dormant but possibly revivable IP's Thief and Legacy of Kain. They're just a much better fit for Xbox.
