You can find a gem in the rough looking at outside talent, but i think having them im defense is also a liability if they have never played the game. He awareness is just not there. If he was to play he should be playing as a tagger or as a defensive half forward. Learn the game that way as sheeds would have done. He is not really improving over where he was last year in terms of understanding the game.
Getting a basketballer or volleyball player as a ruckman is probably as easier transition to our game.
We should blood the kids rather than him, as the chance of them becoming afl footballers in two to three years is more realistic.