Barcelona's defense was good throughout the early season of La Liga. But once their match with Real Marid and lost 3-1 to it, I think the confidence from the Barcelona player's viewpoint about their defense suffered as well. Maybe there was some doubt about it and we'll see how Xavi tries to stock up the player's confidence. I'm sure Barcelona will have an easy match against other teams in La Liga. Tho in their next game where they have to meet Bayern, that's where Barcelona's defense will be truly tested again and Xavi has to come up with something new here.
Considering loss from Real Madrid 3-1 but Barcelona defense still solid and the best until ten games in La Liga, conceded 4 goals only and Real Madrid top standings have conceded 8 goals. Comparison between rival team exactly Barcelona still have solid with defense area, after losing from Real Madrid not really difficult for Xavi get back confidence to win from Villareal 3-0, actually La Liga still under controlling by Barcelona and have exceptional when Barcelona facing Bayern at Champion League on middle week.
I don't think Barcelona keep favorite to win from Bayern depend head to head never get lucky last several matches before, however most important games and Barcelona should win from Bayern and hope Plzen could help them to beat Inter for have chance Barcelona qualify to next round.