Who said understudy? Back in the early Mancini days Kolarov and Gael split it 50/50.
I think our days of back ups are a thing of the past tbh. You think Danilo left Real to be understudy to Walker, or Bernardo came to be understudy to Dave? Think again. We're stacking this squad for a war on four fronts.
I think if Rose was looking at the rags we'd have heard much, much more from their side by now. On the flip side, Rose shares an agent with Walker, and mission 1 was to get the healthy player out. It'll be easier to get Spurs to sell an injured player.