So...are we going to leave it to the Hazou pilot or we going to decide on it in some way? I'm confused
I see it more that Hazou, in-character, confessed to feeling a
personal stake in the Nara vote,
beyond his familial obligations to Keiko. He said this to
Ino, in a romantic context,
before asking her to spend time with Akane. I know we added that part, but the timing (and the fact that the QMs could have just as easily ignored that part, if it went against their desires) makes it clear that Hazou, as a character, is at least
open to a multi-party relationship, but (seemingly)
only if it's interconnected in some way (or, at least, if everyone agrees and gets along with each other).
Hazou has come a long way from the boy who didn't realize that he was dumped, and I believe that there's
no chance that he, a student of Mari, failed to realize the obvious implications of his words.
So, I would say that it'd be reasonable for Hazou to make sure Akane would be comfortable with such a dynamic
before deciding (one way or another) on that path.
That said, I'd still vote for a plan that had something to the effect of "Hazou responds to Akane's answer [about her feelings on an interconnected polygon] compassionately, but otherwise on Hazou-pilot."