[lfe.]

I still see Namie as a possibility. As the poll says, its not like shes dead. Even though she will be retired, it wouldn't really be cheating if she came back for a special event performance. If they asked her and theres enough pleads from the fans, I'm sure she would atleast consider it. She already has Hero, which was used as Japan's olympic theme for Rio, and Japan seems to love that song, one performance wouldn't be too much to ask.

Hikki would be great too.

The author could have included Ayu, but not really necessary, fans would just be disappointed with the results, her popularity and demand just isn't there anymore.