Snake
Snake's Alive!
And yet the best five eighth I've ever seen since the mid 60s was Wally Lewis, and he was big enough for the forwards and played lock often also. Size isn't an impediment for 5/8, as long as the player has good speed and turning ability, good defence, top passing skills and can make an impact against the defence. What small amounts of what I've seen of Schuster, he has all those qualities. I think young Fulton got it right. He has far more basic skill with the ball from what I've seen than Matterson, Graham and Stewart. Its a question as to whether he can bring that skill to first grade.
I hope he does play 5/8 so you can get it out of your system once and for all.