I thought maybe that was it, but going through the plant, it was controllers all the way down. The ex-HQ of the Monolith was now a home to ~15 controllers, all together in the same area.
All the Monolith corpses were still there littering the floor from my first visit, but now the plant was infested with controllers. The second time I went through the plant, I had with me a couple Loner friends I picked up at Beard's ship/tavern, the Skadovsk, in Zaton. When I went through the Chernobyl power plant the first time, some time ago, I had to fight through what appeared to be a Monolith HQ based out of the first largish room you encounter in the plant. I have all the documents from all the labs and underground areas from all of the STALKER games, and I'm on what I think is the last bit of the 'story'.
I'm still playing a loner and following the very basic story objectives given in the game.
Playing more of the Call of Chernobyl mega mod.