He's not signing with AEW. Zero chance Kenny's staying. Even if he still wants to, Punk will see that The Elites contracts aren't renewed, and no Elite, no Kota.
We already know they're not actually gonna do a hard brand split. That means the plan's for sure gonna now be "get rid of everyone who doesn't wanna work with Punk". The only question is whether Tony just lets their contracts expire, buys them out, or simply fires 'em in some sort of Saturday Night Massacresque operation.
Phil is at least as bad as his harshest critics always said he was.