Vol 2 is "I told you this story so I can tell you the next one without you feeling like we cheated a plothole"

Also, had to include characters the public demanded.

Likely some sort of unnoticed background event that will be relevant by Vol 4 or 8.
-Especially the parts we don't understand to such an extent we aren't even discussing it for fear of plot-blocking the show.

What we do have, is more of Yang's past, and how she's acting as a guide/mentor for Blake.
-Even Weiss is helping look after her well-being. [i]Weiss[/I].

At times I'm not sure Ruby even realizes she's leading them. Or rather, how to lead. Or is she avoiding responsibility?