Yeah, I completely agree that we need a player that will control the midfield, I mean that is very obvious.
But what I think @
Zincubus is trying to say is that we cannot solely rely on Messi to create chances; Rakitic and Iniesta are making like 1 or 2 through balls per game, and they are not a consistent source of creativity (I'm not saying through balls are the only way to create a chance), they contribute very little to offense unless Iniesta pulls something from the hat 1 in 20 matches or Rakitic makes a great pass 1 in 10-15 matches, and that is very poor.
Now the question is: Is Turan a creative type midfielder or the one that controls the game? Depending on what is his "genre" we should buy the other type.
Btw, if Coutinho comes for 30mil, I mean, I'm all for it, that is really cheap considering the market (I doubt he's 30mil, its more like 50 or 60 min). Plus we need some really quality subs, look at Real: Modric, James, Isco, Kroos, Casemiro, Kovacic, Cheryshev that is a lot of talent and super subs that can change the game.