Your forgetting that the game explains why there are only 2 kahunas in the elite 4 . Firstly kukui asks the kahunas to be the elite 4 members Both hala and Olivia say yesNanu however straight says no , He is the kahuna because the tapu chose him and he can ' t argue with a tapu , but he can argue with a person . So acelora replaced himAnd at this time there is no 4 th kahuna , Hapu only becomes the kahuna shortly before the elite 4 is finished which is way to late for hapu to be considered . So Kahila was chosen because she is a supposed friend of kukui ' s , therefore he would have known about her previous acoplisments as a trainer and how strong she was , and thus she was chosen . However this is the games explaination behind Nintendo and its goddam logic so your arguement is still 100 % valid as how the keep up their duties is still unexplained i think and they could of chosen another trail captain or other character instead of Kahili but I prefer the fresh faceEdit I dun goofed