Is the Elite really Bullet Club anymore? I see Bullet Club as the Tongans, Bone Soldier (and Robbie Eagles?) and Jay with Gedo and their current feud with Okada and Chaos. But you have Ishii split off with his feud with Suzuki. The rest of Elite has been tagging against Tanahashi during Jr. Tag League. Golden Lovers are tagging against Tana and Finlay at Power Struggle.
To me, Cody, The Bucks and Page can leave and I won't blink. Page has some things he could still do in Japan if he stays but he seems attached to Cody. Kenny leaving would be the only big loss to the company given he's a legit main event guy. Cody probably won't have the US title for much longer if they're out the door. I like Marty in the junior division but it's kind of a mess right now with Hiromu out and Opsreay is flirting with moving up to heavyweight.
I think you can have a faction with Kenny/Kota/Marty/Chase/Yujiro going forward. Considering you have Tanahashi also in the main event and he's really never associated with a stable or group.