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.
Although Alonso seems as a threat with the current performance and display from Bayern Leverkusen but Tuchel who's more experienced has drafted out his plans, processes and techniques and he seems ready for any competition that awaits him. He's got a good team for himself and I believe he'd be able to be victorious in 95% of his encounters. Bayern Munich is just one good team that are a general threat to every team they're up against and they have better victory chances too.
Although Tuchel is more experienced than Xabi Alonso, it can't guarantee Bayern Munich to win the title of Bundesliga. Xabi Alonso has a great history as a player in many leagues, he must understand how to deal with the long season. As long as Leverkusen has no many injured players, Xabi Alonso is capable to lead Leverkusen to win the title of Bundesliga.