I think KK will run off, or injure him enough that he can't go after the vessel for several years. At this point there's nothing stopping Jigen from scrubbing nerfed Naruto and nerfed Sasuke. Then going on to capture the vessels.I'd be really surprised if KK kills Jigen. At best he will force him to flee. Naru/Sas gonna have their revenge I just don't know how they expect to pull that off.