They are only mentioned in the book as existing on an island full of cannibals

Actually I am suspecting that they are fusing him with Arianne, and making him the lead for the Myrcella coup attempt.

Ummmmm… you're wrong. You are just wrong. Its not taking out the homoerotic tension because that is fabricated. It is removing that good ol boy, respect brotherly relationship that is seen as exclusively male, and making it a male-female relationship, challenging an audience that this relationship can exist without…