Honestly, although I believe Alonso is able to maintain the quality of the Leverkusen squad, I am a little doubtful considering that every season there must be changes. These changes are either for the better or even for the worse and it happens not only to Leverkusen but to all teams in the bundesliga at the moment. Maybe Leverkusen can maintain the stability of the team's performance, but if there is another team that is more experienced in making bigger changes, it will certainly be more difficult than last season. And now Bayern Munich looks more ready to restore the title dominance that was once broken by Leverkusen. So the competition this season will not be as easy as last season and of course Alonso needs a more appropriate strategy.
There is no doubt that change will always be there for a team in the competition, especially the opponents they will face will also change, whether it is developing or declining. To match what they did last season, I can be very sure they will not be able to do it, because without defeat in one season is a very difficult thing, especially the opponents they face will also be more aware of their strengths. But at least I hope Xabi can maintain the performance of his players to still be able to compete at the top. The squad he has has not changed significantly, there are only a few players who come in and out. Also most of the players who were the mainstays last season are still in the squad. I think that will be the capital for him with his squad, because the chemistry they build should be better, so that is something that can make them play solidly to maintain last season's performance.