>>91594984Well, becoming a blue ghost is actually an ideal state for him to be mobile and participate in the story, rather than geriatric and wheelchair-bound. Outside any other consideration, this development lets him participate in the story in a more prominent way than a cameo.
It also demonstrates that one of the only other recurring badass characters in the series was absolutely powerless against Aku, even with an army behind him. This ups the stakes for Jack to find his sword, since it's the only thing that can actually do anything to Aku at all.
So, dual purpose, I suppose. Ashi's narrative only makes sense as an observer of Jack and her outside perspective, tinted by being raised as a cult fanatic. She will likely function in the narrative to assist in bringing Jack back from the brink, since even Jack's own psyche wants him to kill himself. He'll need outside help to convince him to do otherwise.
