I understand his move there but then again I don't. On one hand you're going to Barcelona, the best club in the world. You win the La Liga and the CL. Your wages aren't shit either and you train with the best every day.
On the other hand you're playing the same position as Pedro and Messi in the line-up. You're not going to replace any one of those or Xavi, Iniesta or Busquets and none of them are hardly running their last miles. And it's Barcelona. They won't simply stop buying players or producing them.
Looks to me he's a plaster on their bench who won't end up costing them in the end when he gets sold.