Bayer Leverkusen is not preparing to challenge Bayern Munich for the trophy next season, they don't have a solid team yet and they are already looking at having their team to be young players that's not possible. Their management has failed to retain their key players some of were sold out but that they were eager to leave the team and the management is not even replacing the sold players how do they want to meet up next season?.
Didn't Bayer Leverkusen just sold their coach and some first starting players, from what i know it takes quite some time to build a good team under a new management, next season Bayer Leverksen has bare chance to compete against Bayern Munich for the title, except for when Bayern isn't going to perform too well, but performance we see from Kompany in the Club World Cup already says a lot about Bayern Munich performance next season and how they will dominate the league.
I don't know if Bayer Leverkusen sold the coach or he decided to take a better offer since Real Madrid is a bigger team and they wanted him as a replacement for their coach Ancelotti but selling the 1st team players was a mistake that will hunt them for next season no matter what they try to rebuild. Having a new coach and you will be in the champions League and also compete for the local league without the presence of your strong squad is very bad. Bayern Munich dominated them in the first season of Vincent Kompany, now that he has understood the team you think he won't continue to make turning things difficult for them definitely he's going to give them no chance.