@Abuggyreplay: Yeah unique missionaries in this game work weird, I didn't know it at the time when I made this mod. Chances are the AI are buying the Cultist, but for some reason all AI unique missionaries are turned back to normal missionaries on purchase. This actually includes Maravi's AI so I need to fix this lol. Thanks for the heads up though, I do need to fix this at some point when I gain access to my PC again.

Had fun playing them. The bonuses encourage a very aggressive playstyle where you pillage and burn everything and then go in afterwards with Nyau cultists to rebuild.
There's a bug though, the cultists can be purchased even when you're not playing as Maravi. I haven't seen the AI do this, though perhaps they are and they're just using their invisibility?