I think OP makes clear actually that this was not a MS-inspired coup. MS appears to have had no role in the CSET paper criticism or anything else that I've foun

I think OP makes clear actually that this was not a MS-inspired coup. MS appears to have had no role in the CSET paper criticism or anything else that I've found in the runup, and then during the crisis, being mostly reactive and defaulting to a simple loyalty of 'whatever our guy Altman says' (which included Altman+OA defecting to MS as their BATNA against the Board), and when the war went hot, ultimately decided that the status quo was most in their favor: "As enticing as Plan C initially seemed, Microsoft executives have since concluded that the current situation is the best possible outcome. Moving OpenAI’s staff into Microsoft could have led to costly and time-wasting litigation, in addition to possible government intervention. Under the new framework, Microsoft has gained a nonvoting board seat at OpenAI, giving it greater influence without attracting regulatory scrutiny."