So another Cesc-mouthed player to bring in hill culture to your club? This all depends on what you want to play though, and if Puyol is going to feature in your line up or not. Depends if Alves actually wants to leave or not. Depends on if Cesc is going to replace a striker in your formation or not.
It may work, but right now I cannot look past the whole Catalan banners here, maybe it is because I am waiting for you to fail with your obsession or maybe because it is true. For the price you are getting him, it is not bad at all but this will totally change your team's strucuter unless Alba himself develops into a much better defender/player. And it is fair to give him a chance before discounting him so quickly, because Abidal himself was decent at best for the first two years, before he really elevated his game.