Team is rutting. Top of the league means nothing when your only rival has been experiencing their own rut and you're paying the likes of Messi and Suarez weekly.
There was and still is a very real danger of players completely taking over the dressing room regardless of who becomes manager. This is why the likes of Iniesta and Xavi have been asked to be more present in recent weeks. Xavi apparently turned down the club's offer to take over. I think he made the right choice. He's too young to be respected enough by some of these big names who have already shown signs of a cult with Valverde acting as their puppet.