I personally don't think they would have had this slump if Pep was still coach, but thats just me speculating. I think the gravity of their problems became even more magnified by the fact that Tito while being a decent coach isn't that great tactically, and Roura his assistant is extremely poor. This group of Barcelona players need a manager that keeps them on their toes. Someone like Pep who had no qualms sending away the likes of Eto'o, Zlatan(after just one year), Ronaldinho and Deco because he thought they weren't committed enough and didn't work hard enough on the field, was the right manager for them. I'm not sure if you follow Barca, but from the start of this season, it was obvious that they didn't work as hard in pressuring the opposition and retaining possession, Pep mixed it around a bit with tactical formations, and played with 3 at the back sometimes to keep them from being predictable (See the first classico in the league last season). There is an obvious difference between Pep and his predecessors imo.
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Elaborate.