The problem I have with signing Rakitic for Cesc is that our midfield won't have that many starting calibre players. We'll have depth and utility, but actual starters? Busquets, Iniesta are world-class... I guess Xavi can put in a shift if he's well rested and is still one of the best at what he does, but who will rest him? Rafinha is very promising but in my opinion not ready to start yet, Mascherano is a fairly solid DM for Argentina but I don't know he would do for us, Song is pretty good if he gets played as a box-to-box but we have yet to see if that will happen, and Roberto and Rakitic seem to both be utility men. What do we do if Iniesta gets injured (as happens quite frequently)? Play Rafinha and pray? Start Rakitic? Even Rakitic's biggest supporters have to admit that there is a huge drop off in quality from Iniesta to him.
Cesc, meanwhile, has arguably the best vision on the planet, puts in a lot of goals, and brings quality. This season, he lost his starting spot to Iniesta after winter break, who finally got back into form, and then Cesc got handfuls of appearances, some at false nine, some at left wing, some as a midfielder in a weird 4-4-2, some as a CM to rest Xavi... of course he's going to be inconsistent! It would be much better to keep him and tell him to just play CM, and organize a 3-man rotation between him, Xavi and Iniesta, with the two in the best form starting the big games, and then Rafinha providing the competition and depth and utility. Now, we have two starters and 3 bench players, with a clear distinction between them. Could it work? Maybe. Is it an improvement to the team? I can't see it being one.