Brian:
I think the IETF Chair slot is a different matter. Yes, the IETF Chair is
also the IESG Chair, but I don't believe s/he is in the IAOC on behalf of
the IESG. On the contrary, it's on behalf of the IETF. I think it's
exactly right that the IETF Chair votes in the IAOC, because nobody
else has the same overview, and also because I believe that any IETF Chair
who did not closely track the IAOC's business would be irresponsible.
This document does not discuss the IETF Chair's seat at all. A few years ago,
we had a discussion about that on the ietf(_at_)ietf(_dot_)org list, and the
community made it clear at that time that the IETF Chair needed to have a
voting seat on the IAOC.
Russ