If he returned to Barcelona, he must have the chance to make Barcelona strong again. However, it is impossible to do if Barcelona management has no money. It is the same as Xavi, he has good ability as a manager but he can't do much to improve Barcelona because Barcelona management has no enough money. Buying quality players require money, how to sign them if Barcelona has no money? The main problem of Barcelona isn't about the quality of manager (coach) but it is all about the funds (money).
I think you can't claim that Barcelona still has good squad. If they have good squad, they won't be defeated by Girona. The defeat from Girona in matchday 16 proved that Barcelona has some problems. Barcelona attackers can't play effectively, they just made many shots but less of goals. The defense also looked very weak, how can Barcelona could have 4 conceded goals? According to the result of this match, Barcelona have weak attackers and defenders. The coach needs to rebuild the players on these 2 lines (attacking and defense).