The win is with the exiting employees - it's much better to be benevolent in this situation. Sure it costs a little more but just see that as an investment in the rest of the company.
I wasn't referring to letting the stock vest. I was referring to the concept of leaving them on the payroll until their stock vests. There's no reason not to vest the stock early and send them on their way.
Unless the original poster wanted to give them severance.
I know - I would personally just put them on gardening leave until their stocks vest. Sure that costs money but not a lot - it's probably worth it for the lack of drama.
It's < 10 people, so getting the message out isn't an issue. So I wouldn't worry about drama wrt people thinking he got screwed out of his stock. Can even hold a meeting about it.