I already said: for the duo of 4-4-2, Rossi. He can guarantee more goals and more team work than the chilean.
This tactic lives of creating moments of the wings and we'd need a proper LW as well. I'd like Sanchez for the wing. Now, some come and say: "but he's more effective in the center". Fine, statically talking, but in that department even Rossi is better. And don't say that Sanchez can't defend because he can.