Personally I like the idea of a Tyrant redemption arc. I am a big fan of Praetoria in general though. IIRC, there was even an idea of the reformed Rikti showing up with a mothership or two to help out in the invasion, which would be kino af. Now that would be one hell of a redemption arc. You'd go from all "The only good Rikti is a dead Rikti" and "If they run they're Rikti, if they don't, they're well disciplined Rikti" in RWZ to cheering them on. Maybe involving a space battle, and crashing the Rikti mothership into the Batallion mothership at the end for a daring and desperate boarding action that starts in the Rikti ship interior and ending in the Batallion ship.
If Battalion ever gets made, and given that everyone seems to not feel a need for further power expansion, the HC devs could make the story arc involve cutting further access for the PC to the Well in some way.