I have seen how Munich played against Leverkusen, Aston Villa and Frankfurt, Defence is still a problem that Kompany has not been able to overcome especially in the last match where they conceded three goals. This kind of defense is very easy for Barcelona to penetrate, especially since their front line has been very productive this season.
If defense is still Bayern Munich's weak point, Kompany will definitely make improvements when facing Barcelona in the Champions League after the international break is over.
Barcelona is indeed in the best condition but Barcelona's victory so far is because the teams they have defeated are overall still below Bayern Munich's quality.
Visiting Barcelona's headquarters, I still don't think Bayern Munich can have high-level difficulties like the lower teams in the domestic league.
A very Healthy attack is one thing kompany has been able to build with Bayern Munich and that has been of a great advantage to him and one thing he shouldn't fail to do just already is to make sure is defense is equally balanced aswell, he's very smart enough to get a strategy that has helped him cover up for the defensive lapses but then that may not apply to every opponent so its become very important kompany start working on the strength of his defense so when he get goals he will be able to guard his goals to victory in every game.