He also admitted he's failed to show leadership in making the case for assignment in public. I would not call the closed door nature of Harmony discussions under Chatham House rules "evidence" of progress at all.
As far as I'm concerning Harmony under Chatham House rules was lost time and effort. Harmony is rebooting now with a public mailinglist. We'll see if Mark shows up on that publicly archived list and makes the case for assignment in his renewed effort to show leadership in this area. The continued lack of public discourse from him continues to be disturbing.