User blog comment:Western Gen/Speculations for Season 12/@comment-24215221-20140805023416/@comment-30133540-20140805024329

Well they were supposed to go back to Blood Gulch, as revealed by Donut in Worst Laid Plans. So I think the possibility of them using Halo 2 Anniversary to do that would be possible.

Though Junior or Sister coming back is a bit of a stretch.