TBH robbiea....as ridiculous as it sounds ....would not trade any opposition NRL youngster in the halves for young Latu Fainu....in fact any young opposition player.
Born to play the game, this kid has EVERY skill to go all the way including my personal favourite "Instinctive Unpredictability" and add "Competitor"...in a game that is built on completions and robotic elements, this type of player is rare and can break a game open....I realise the question is more based on "who will step up in the current crop of youngsters".....but I see Fainu ready to step up at 18, which will basically have him ready when DCE finishes at Manly.
To answer your question I personally rate, Burton though a 6 - has Massive potential but zero chance of anything but distinguishing his career at Dogs and though many don't like Walker and I agree defensively which will improve, he is the best young 7 today imo.