I haven't seen anyone at Kos (or elsewhere, for that matter) talk about this story yet.
From Haaretz: Brahimi's move was "brewing for a number of days, [and] shocked the diplomatic community at the world body. Brahimi explained that his decision stemmed from great difficulties and frustration experienced during his assignment in Iraq. He said that he does not intend to return to Iraq."
Nothing to see here, move along...