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I can't see Unohana dying against Kenpachi or a SR at this point. That would be too much anti-climactic.
Granted, Bach's persona isn't quite the same, but still, their interest isn't lying in killing off the captains, either.
I'm kind of disappointed with Unohana since the last chapter, but I don't think she'll die here either. She hasn't revealed Minazuki's true power, and I'm sure she won't die until she does. Hopefully she redeems herself later though. Still, as the new Elder of the Shinigami, it wouldn't be too surprising if she goes out like Yama did.
Actually though, I wouldn't be surprised if one or two of the Royal Guard got killed during this war. I don't know who there is on Team Vandenreich that could actually do it besides Bach, but I just have a feeling. Bach must have something up his sleeve where the RG are concerned.
Regarding the VC, still no word on Kiba and I'd be disappointed if something happened to Iba. Judging by how the things work, it's more than likely that for a VC to die, first, the captain has to go down.
I don't remember where it was written, but on some databook/omake or something (maybe it was only ever released in Japan) it said Kommamaru was from amongst a race of unique fox spirits in SS. There are actually more people like Kommamaru in SS IRRC but we have yet to see them on screen.
In Japanese folklore there's a lot about fox spirits and you guys can tell this by how much the whole fox spirit idea is used in anime and manga (Naruto, Yu Yu Hakusho etc).
You can read more about the significance of fox spirits in Japanese folklore here: