Xavi, Iniesta and Busquets were the basis of Barca's style from 2010-2012, the only constant in the front 3 was Messi and he played with Villa,Pedro,Ibra, Sanchez at various points of the season. That midfield is one of the best 3 man midfields I have ever seen. Many teams play with a base of 2 central midfielders and an advanced 10 so it's difficult to compare with Barca's 4-3-3. Bayern's 2013 with Schweinsteiger-Martinez-Kroos/Muller was impressive enough and Liverpool that one season with Alonso-Mascherano-Gerrard could have been good if Benitez wasn't trying to get Barry.