User blog comment:CNBA3/Future Filler Arcs (WARNING: ANIME WATCHERS, MANGA SPOILERS!!!)/@comment-24277053-20140629212549

I don't know if the manga is going to address it themselves in flashback, but I like to see how Yukino rejoined Sabertooth. Perhaps when she does appear again in the story, someone like Lucy will asked "you are with Sabertooth?" and than quick flashback. If not, that something for the anime to expand on.