Could be a hint to a change in style, Walsh is certainly a winger but (IMO) McCowan is not, you would more describe him as a forward than someone getting the ball across the face of goal or whipping something in from wide. Then you have Dario, a winger, yes, someone who you'd trust? No.
Kerr seems to like the idea of getting the ball in the box as much as possible and neither McCowan or Zanatta are going to do that for different reasons. Could see a more simple 442 with McCowan playing as a striker off Wright when fit. What it would mean for Smith I have no idea.