Schofield is the stand out for me. A brilliant player who could control and change a game. Had left the UK when he started with Hull but I saw quite a lot of him when he played in Aus both with Gt Britain and Balmain when he mostly played as a stand-off. Billy Batten would partner him.
My favourite centre would have to be Roy Francis who possessed a wonderful " rugby brain" shown to the full when he later coached the club to great success in the 50's.