I really think if we have to keep Sigurdsson and Rooney, we should try and retrain or try Ross as a wide player or attacking player, the way many strikers are used wide in 4-2-3-1 systems. We need a winger, he's two footed, we need a striker, he's quick and pacy, I think we should consider the fact that the no.10 role is a fashion and slightly overrated and in our team we don't suit a playmaker, but 2-3 ball playing attackers and Ross would certainly fit the bill ...
e.g. say you had 4-2-3-1 or 4-5-1
either way you'd have a 'front 4'
so you have
Bolasie - Gylfi - Ross - Striker (DCL, Niasse, someone new)
Vlasic and Lookman are the reserves for any of these front 4
Rooney plays deep with Gana or Schneiderlin