Its not uncommon for a young second rower to play centre, thompson for the dragons spent a few seasons at centre before moving into the forward back is a classic example and he was quite good at it.
Oates has played at centre in the u20's to great effect i might add, Griffin would not of gotten the idea to put him on the wing if he didnt think he could play out wide in the first palce. your saying a second rower who can play wing cannot be the median which is centre? if anything he would perfect for it while he was young and there is an abundance of second rowers at the club
He is a great utility able to play wing, CENTRE and 2nd row. but could easily start in any of those