I left Preston and the group alive, but never returned to Sanctuary. Jammer later starts talking about how I should have gotten rid of them in Concord. I decided to order a raid on Sanctuary to take them all down. When I get there, I am met with resistance from hired Gunners. Does this imply Preston hired the Gunners to defend Sanctuary from me? Preston did not actually do anything in the battle, ignoring both the Gunners and my Raiders as he did his usual Sanctuary patrol. I captured Sturges & crew, and took Sanctuary as an outpost. Preston is still patrolling and whistling a merry tune as I decorate the town with severed heads and dismembered bodies. His dialogue is stuck saying "I'm glad you decided to join us." I took the Castle with SKK Workshop Utilities and made it my raider gang HQ. I've had a lot of Gunner attacks on the base and in the most recent attack, my gang was saved by a patrolling group of Minutemen that had spawned near the Gunner's attack point. This has been a weird play-through!