One would expect absentee ballots to favor Chris Cannon, as they tend to be cast by voters some time earlier. It was only in the last few weeks that John Jacob's campaign really got on the radar.
Ya, maybe, plus I suspect absentee voters are a bit higher in socio economic class than same day voters overall, and on this issue, that cohort might be somewhat more pro Cannon. That is why I don't think absentee votes can be used to project anything. Plus, there don't seem to be many of them. It ain't California, where they can be a third of the vote these days.