All these other conspiracies are ridiculous and do not at all reflect much simpler, economics-driven realities that the board's backers - investors - are interested in.
It's like that Altman and Brockman wanted to take an economically positive offer now, say a complete buyout from Microsoft, and the rest of the board wanted to do an additional fundraising round that would be far less cash but a far higher valuation. Now that the private fundraising is probably signed, those guys are out.