I have to disagree here. I don't think Ibra was the BEST fit for Barca, but a player of his quality could of always fit in. As many players we have recently bought, early on in the season they do great because the team doesn't really have a system including them yet or the coach hasn't decided how to use them yet. Cesc did great when he first got here, so did Ibra. Both quality players who just did what they knew how to do.
Eventually, Cesc started being played as a false 9 for some reason....his performance declined dramatically. After the beginning of the season, Ibra just sat at the last defenders. I can tell you with 100% certainty that it wasn't Ibra's idea...he was being told to do that by Pep- probably to draw defenders to him and open up the wings.
I don't think Ibra was used correctly, Cesc wasn't either...but they are gone now, so who really cares