((I can also confirm, for those curious, that regardless of whether you don't interact with the mindflayer, interact with it and leave it alive, or even feed it your brain so that ti's very alive, and then run away..... It doe snot change or affect anything in the shattered sanctum scene with dror ragzlin. In fact, you can have him speak to the dead mindfalyer, after feeding it your brain in the wreckage, and then hike back to the wreckage and still find the healed mindflayer very much still alive and still hostile to you. this is sad, I wanted a hidden altertnative route.))
My point exactly, the Dror Ragzlin outcome has two different options: you deceive, using the tadpole, the bugbear thus he doesn't kill your character or the mindflier awakes and out the player's toon as the killer, so to help the mindflier should have an impact even if the slightest (for example the gaith being alive and talking with Dror).
For an evil playstyle (one of the many ways an evil road can be followed) trying to ally with the mindfliers could be an option.
