Maintaining the squad is indeed one way to be able to maintain their consistency for next season, because if they continue to change players then it is difficult for them to maintain their consistency. Because basically Bayer Leverkusen is not an elite team, so with finances that are not as good as Real Madrid, it is at least difficult for Bayer Leverkusen to maintain many of its key players. But indeed, considering the way Real Madrid always has young players who are willing to stay in the team for a long time,then Real Madrid also manages to have a good performance every season, because the team has a good chemistry. Therefore, if Bayer Leverkusen is able and successful in retaining its key players then ofcourse, Bayer Leverkusen has a chance to still be able to play well in the next season.
It can indeed be one of the good options because at least with the players who are still awake in the squad, they can still display solid cooperation only on the other hand this can also have a slightly worse impact when several clubs start moving to get new schemes but Leverkusen still remains the same player because after all Leverkusen's task this season is much more difficult than last season where for now they have to maintain performance, competition and of course the trophy and this is clearly a difficult condition to do especially this season it could be Bayern changing back to the previous mode even though Kompany is currently still considered doubtful by some.
Hopefully Xabi does not lose his magic and Leverkusen's performance remains the same as before so that the competition for the Bundesliga trophy is still maintained like this season next season.