Because playing Ale means either 4-4-2, which means no Diego (and presently, no creative midfielder in the center), or a 4-3-1-2, which benches Giovinco and plays Candreva or Camoranesi out of position, while exposing our fullbacks. I personally would alternate between a 4-2-3-1 with Diego as the AMC, and a 4-4-2 with Ale partnering someone up front, depending on what our game plan is.