Myst's feed

I think doha is the og player and the other npcs are playable characters and thats why they have their own save tapes/radios. Maybe the tape with the check is Badas tape that caused him to remember everything originally. Maybe Doha only revealed that he remembered because Bada said he liked him and Doha likes Bada. He did jump on Bada really quickly for a guy who didn't know him previously