Arrigo Sacchi, the innovator who coached AC Milan to a pair of European Cups, once declared that the next step in the evolution of football would be the conversion of the entire pitch to one midfield area. The teams at the vanguard of tactical rejuvenation would be able to count on players to line up in a range of positions on the field of play but actually function as midfielders; closing space and passing accurately within their sectors, using the ball intelligently, moving well off it.
I really doubt Fabregas will fit in Barcelona. Reason is simple: he keeps the ball for a too long time. He is not good enough to make fast descisions in the highest level.
Fabregas will play as a Xavi replacment in case he gets injured when Xavi fit he will warm the bench