1. Sorry, cannot answer your first question.
2. You'll always be able to find another mindflayer in the east room, just north of the room where the slaves were kept. Keep using the control collars to open the doors. Yes, the MF's will turn on you after opening one door, so be prepared to kill them immediately after opening the door.
***** SPOILER ****
The Mindflayer brain is in a room in the northwest of the compound.
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