Right. They aren't actually voting for Sam Altman. If I'm working at a company and I see as little as 10% of the company jump ship I think "I'd better get the frik outta here". Especially if I respect the other people who are leaving. This isnt a blind vote. This is a rolling snowball.
I don't think very many people actually need to believe in Sam Altman for basically everyone to switch to Microsoft.
95% doesn't show a large amount of loyalty to Sam it shows a low amount of loyalty to OpenAI.
So it looks like a VERY normal company.