Everyone knows how important Xabi's role was in turning Leverkusen's game into a very strong one. I think they are very ready for a competition as big as the Champions League. and they will be able to compete with other strong European teams.
they prepare better, I'm sure they won't end up like Napoli last season. where they won Serie A but then they had great difficulty competing with other teams both in Serie A and in the Champions League.
Bayer Leverkusen and Napoli are of course very different because the teams are coached by different people so Xabi Alonso's role at Bayer Leverkusen cannot be compared to the role of other coaches in other teams. I also think that Bayer Leverkusen is very ready to undergo next season which is full of even greater competition than this season because Bayer Leverkusen fans also really want to see the team they support again be able to win again in the Bundesliga and be able to go further in the Champions League.
I don't think it's about comparing their coaches, because it seems like it would be more appropriate if the comparison was about the overall quality of the team and not just about the coach. After all, in my view Bayer Leverkusen is also a mediocre team that had absolutely no chance of good results before. Therefore, comparing them with Napoli might still be more balanced but indeed, the success factor of the manager certainly makes their difference even greater. But indeed, about Bayer Leverkusen because it has still has a great manager in the next season, then of course Bayer Leverkusen still has a guarantee for good results also in the next season.