>>44808473>>44808635Because the island challenge used to be a gauntlet match against all 4 kahunas to become the champion, so the league kind of kept that tradition by making the kahunas the elite four.
But Nanu told Kukui to eat shit and Hapu was still a fresh Kahuna so they only got Hala and Olivia, Acerola to stand in for Nanu, and Kahili was the former island champion, the strongest in Alola.
Kukui just rushed things up.