Oddly enough, this reminds me of the Cult of Mendez from Planet of the apes. Only instead of worshipping an atomic bomb, they worship the Machine god, and instead of them being mutant psykers, they are all cyborgs. but still the similarity is there.
A little late, but their all connected to the one in the throne, known as Tech Priests (Or higher being Magos), the ones with cables connecting them are servitors, or the TP's adepts. In this case, I believe it's servitors connecting to their master. This way, they can exchange (More so he takes what he needs from their memories), data by millions of streams.