He seemed to have gotten the message with Kahler that he never got with O'Dwyer or Samau, fortunately.
And of course you are correct, Walker is a fullback and nothing else, unless they move Preston to the halves making room at fullback, it's pointless throwing him in there just to be a winger, we need height and weight on the flanks, not just speed. Might be a nice impact player off the bench, but again, only if you put him at fullback.