Bayern Munich is one team that has very good player combinations, they have in the team quality and skilful players who are in their various positions performing their best. Yes there are competitions from Leverkusen in the Bundesliga and a lot more competitions in the UCL but the team is capable of subduing the stress of the competitions. Tuchel has his eyes on the Bundesliga trophy and a bigger eye on the UCL trophy.
No doubt that Bayern Munich is a big team, they have many top players in their squad. But this season, Bayern Munich has a tough competitor, it is Leverkusen. Although Bayern Munich performed quite well in Bundesliga but Leverkusen is leading the table now. Leverkusen could play more consistently, they never got a defeat. Leverkusen also performed perfectly in UEL, they also never got a defeat, too. Tuchel must get difficulty to compete with Leverkusen in Bundesliga because Leverkusen is on fire this season.
I still think the difference is not that huge, and Bayern could still do very well. Bayern is missing one game, if they win that extra game they would be 41 points and Leverkusen is at 42, that means even with just a single draw game, they would go to second position in the standings and Bayern would go to first. Leverkusen may have looked great so far, but they are not clearly the leader, they are barely the leader, may look like 4 points today, but Bayern has one less game so it's not that clear.
I believe that Leverkusen may still fail. I have been saying this since the start of the season and so far they are still the leader, so I can't really say that they are doing badly, so far they have proven me wrong, lets assume if they will keep this up.