Sam also played his hand extremely well; he's likely learned from watching hundreds of founder blowups over the years. He never really seemed angry publicly as he gained support from all the staff including Ilya & Mira. I had little doubt Emmett Shear would also welcome Sam's return since they were both in the first YC batch together.
If that were the case, would they not have presented the new CEO immediately for an “orderly transition”? As I understand it, Ms Murati tried to get Altman back, and when she pressured the board, they tried at least two other possible CEOs before settling on Mr Shear, who also threatened to leave if they could not give evidence of a legal reason for firing Altman. It smells like a personality conflict.