I'm not sure what there is to ask. I was mostly commenting on how you worded that, I suppose. It kind of read as though you think Jono was, for a time, deeply involved in Gnome or something, and I can't think of any way that he's really contributed to Gnome except to voice his opinion on things people are doing. I don't think being on Planet Gnome and going to Guadec is a good measurement of how entwined someone is in Gnome. Mark was on Planet Gnome for awhile too, and he goes to Guadec usually. The first time I met him was at Boston Summit. I never would have considered Mark deeply entwined in Gnome though, and I don't think most people would.
Then again, I'm not really involved in Gnome anymore either. So maybe I'm totally wrong and he's doing all kinds of stuff for Gnome now and I just don't pay attention anymore. But my experience working at Canonical was that it's more difficult, not easier, to stay involved in upstream projects.