Funa actually saw himself as a 5/8 in the juniors and played there in Harold Matts and SG Ball...When he first came into u/20s there was a selection of halves in front of him (Cust, Tom Wright etc.) so he was put a little wider in the centres (a natural demotion from 6). Then, when those players moved up, Wayne Lambkin (then u/20s coach) manufactured him into a fullback because the likes of Jade Anderson went up to NSW Cup and on the fringe of FG.
So, he has never really nailed down a position. He is not completely untried at 5/8, although I wouldn't call u/16s and u/18s professional experience.
I think he is a real trier but I don't see more than a squad player in him to be honest; he is Brendan Elliot.