Frohike, Langly and Byers are Faking the Dead
.- Confirmed by Word of God.
Jimmy and Yves had a Last Minute Hook Up off-screen, between the penultimate and final scenes of "Jump the Shark".
Jimmy, Yves and Kimmy become the new Gunmen after the events of "Jump the Shark".
- This quote by Morris Fletcher seems to make it pretty clear:Fletcher (looking between the Gunmen and Jimmy): Publishing this paper is a younger man's game. [glances to Yves] Or a woman's.
- Kimmy joins them because of Rule of Three, and also because he played The Sixth Ranger to their Five-Man Band for the latter half of the series and "Jump the Shark".