I agree that we haven't really seen enough of Yama's character yet but I have faith that is actually a very interesting character! :D

Yeah, I'd like to see all the fights since it would make this arc feel more connected, you know? Seeing both fronts would be awesome and give this arc a really exciting feeling. I think it would be great if Kubo did that (though I'll admit that I'm more interested in how we're getting the HM group OUT of there *frets nervously*)

I think it's the Winter War arc. Or at least that's what I've been thinking of it as ;p