Leverkusen will still be the most favorite team, especially since the squad has not undergone any changes, they may even bring in new players and Xabi will remain at Leverkusen. However, it is impossible to repeat the success of winning the Bundesliga trophy without defeat next season. Because of course they will also play in the UCL league next season which is very competitive, especially with the new format of course the schedule will also be even busier which will have an impact on the players' fitness.
Next season will never be the same as last season, regardless of the new or old format, because Leverkusen's rival teams in the Bundesliga will definitely not allow Leverkusen to continue setting new records there. And apart from that, in the Champions League it will certainly be quite difficult for any team to compete because there are many giant teams from various leagues entering there to compete so it will definitely make Leverkusen a little overwhelmed to face it and keep themselves from losing like last season.