Thoughts on Possible Vigilante(s)
Since vigs are 1-shot and have a chance of missing with that many players, they could have assumed other vigs were in play. If they thought that, they wouldn't use their shot because of the low odds. With Dusty dead, there should be 1-2 vigs left at most (50% or 33% chance). They could have missed if there were 2 vigs remaining (33%), but its more likely that the mafia missed a shot rather than a town member (since we don't want to factor out a possible mafia vig).
The mafia should have shared what roles they picked by now. If they actually went for Rantai based on him being a Bodyguard, they must not have picked any good roles. By Rantai's reaction, he didn't seem like he protected anyone. It's likely he got killed by the mafia.
Sync, thinking that the mafia would try to frame you with Rantai's kill seems unlikely. On your part, it just seems like you were trying to defend yourself in some way rather than help the town.
I'm expecting foulcoon or Sync to be mafia at this time. I just feel like foulcoon is mafia, but with no really reasoning (gut feeling).
Yeah, that's enough post content for now...