Shall we say "top 2"? 
Because Xabi Alonso achieved a sensational success in his first season there. And he still managed to keep his team's presence in top 2 in his last season.
Top 2 is okay for Leverkusen this season, apparently from next season that is when they will consider going straight for the title. This is a new manager, some fresh players and used tactics are different and new to everyone, it will be too demanding if the club or anyone should burden Erik ten Hag for the title. Because Xabi Alonso achieved a sensational success in his first season there. And he still managed to keep his team's presence in top 2 in his last season.No body have to call him failing or better based on the pre-season games, the main deal starts when the season begins, at least half matches played.
If you remember, Xabi came to Leverkusen in the middle of the season, when Leverkusen was hanging around the relegation zone and was able to immediately lift them to the top, and the next season make them champions. In this regard, Ten Hag has a hundred times better conditions - he has the whole summer to prepare the team for the season and this is not a team in decline, but a solid, well-played squad, a confident top-2 in Germany. Why wouldn't you want Ten Hag to improve given his starting position? Bayern are incredibly difficult to beat, but they should be competitive.