Just to be absolutely clear about this: I have heard exactly what I've said earlier, so I don't mean to start unhelpful rumours or pretend I know more about it than I do. For all I know, he resigned because he really did want to spend more time with his family (or more time with a job that paid a lot more).
Given that I'm less plugged in than many others around here, I thought if something really concerning happened someone might have heard about it. Why they would tell anyone about it is a different matter - just covering all bases, I guess.
S