I'm nearing the endgame, planning to go with the Railroad faction. The catch - I can't dismiss X6-88, so every time I try to go to the Railroad HQ to finish Rockets' Red Glare & start The Nuclear Option, the Railroad turns hostile. I've tried replacing him with other companions, but X6-88 keeps tagging along anyways. It'd be a handy glitch, having 2 companions, if it weren't for the whole Railroad-wanting-me-dead-for-palling-around-with-a-courser thing. I've tried dismissing him outright too, & he'll go to a settlement and start planting or whatever I assign him to do, but as soon as I leave, he starts to follow. How do I get rid of this persistent and unwanted companion?