Anyone looking at revenge is making a very short term plan. Barcelona is doing great and may win the Laliga if they continue this way. They will only slide because of lack of squad depth which their major rivals have.
But I have a top for Flick and that is; win El Classico home and away, you have automatically won the Laliga.
That is very close to the tactics that Xavi Hernandez used.
Hansi Flick is new to the system but he actually understands how to handled an elite club in La Liga. Remind you he's no newbie coach but experienced man, he's the man for the job and elevating the standard of Barcelona this season. Winning the league wouldn't be challenging except for the presence of Real Madrid and Carlo Ancelotti. He just have to deal with the problem because running from it wouldn't solve anything. The El Clasico coming up after international break, who do you see winning the game? For me, Real Madrid have already been seen to be a contending competitive club that actually prioritize accumulating 3 points.