it's not that he doesn't have the body, he doesnt have the ball playing ability (at the moment)..
there is more to a fullbacks game than being safe under the high ball. they act as an extra ball player in the backline to link with the outside backs.
because we havent had a good fullback since hodgson (who could not only take high balls, hit gaps as a support player and link with outside backs with his ball playing ability), tedesco gets wrapped based on his ability in younger grades and for simply catching the high ball (and i wont lie, it is a good feeling having a safe fullback).for his age and the injuries he has occurred, he is doing well. but he's still underdone.
barba, inglis, bowen, slater, stewart, hayne etc. they all have ball playing ability. tedesco does not have it at the moment… and its an obvious when we are trying to get creative especially on the oppositions try line that we are missing that extra link player. fulton steps in at times, but we cant rely on him for that, we need it from the fullback.
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i personally think for tedesco's development if he jumped back to NSW cup and they played him as a five eighth, come 2014 he would be in for a big NRL season in the NRL. he'll find it much easier to learn than playing in an underdone NRL side and it will also improve his ability to pick holes when running as a fullback.