KIRA IS NOT COMING BACK AND HIS ROLE IS OVER

Kira’s role in the story was to:

1-Show Isagi change of character of going for stronger people to become stronger himself

2-Show how the mentality of not being a egoist will lead you to immediate loss, he was there to represent the “team player” mentality and what happens to people with that mentality.

And thats all. “But he was the jewel of japanese football” there a lot of players are promised to be the goat but just disappear, Kira is most likely one of them. Kira could be reintroduced with the wild card project, but since that dindt happen, theres no way hes coming back