Herrera is not a bad player, but I feel the team could do better. At any rate, it is good that they're thinking even with Iniesta's replacement in mind, not just adding one more midfielder. The ideal situation for the midfield of this team is one in which Rakitic is the versatile rotational midfielder who plays a lot but is not a starter, and Iniesta is slowly phased out into the current Xavi role with Rafinha's minutes added on. Rafinha should be player in an attacking role. Yes, that means ideally adding 2 more players for the midfield.