Yep- though he has interacted quite a bit with new character Eldreh Koh and a bit with Buffy's roommate Tumble, while Willow and Xander/Dawn haven't interacted with each other at all (maybe in the first issue?) and Xander/Dawn have only interacted with one of the bad guys (at the meeting he missed) and Buffy. So if we're keeping scorecards, he's next under Buffy in terms of relevance (though even that number is pretty low, since it's been a Buffy-centric arc).