I agree with you that removing him would be the simplest approach, but I
can see possible situations where NOT following the process could lead
us into legal trouble.
Anyone can sue in the US for any reason, but this is silly.
The IAOC made extensive attempts to contact him in many ways, with
zero response. No court I know would find it unreasonable to assume
that he's no longer interested.
I certainly hope that this sort of situation does not recur, but it
seems perfectly reasonable in view of the facts to let the IAOC
proceed as though he's resigned.
R's,
John