Regardless of what happens now for Leverkusen there are indeed several thing that support them to get to this position apart from the experience they have before, the good chemistry between Xabi and the players make Leverkusen what it is now.
That's what makes Xabi become one of the best young coaches in the world today. Because PSV has a style of play that suits what Xabi wants in his football philosophy. Even though he doesn't have any famous star players, or maybe I don't know him, Xabi was able to build strong chemistry between the players and in the end they were able to adopt the tactics and style of play that Xabi wanted.
Xabi has really helped the Bayer Leverkusen team adapt to a good style of play which is difficult for some many coaches to do and I think the chemistry which is talked about him and his players can be seen vividly during training and during matches even though they have got some difficult moments too but he's ablecto keep cool heads with his players and the master class coaching experience that he's got at his age and time of his career is amazing and hopefully he's got the ability to win a trophy with his performance with the team this season.
Concerning Xabi's pattern of play and PSV's playing style I think it's going to be difficult for him to do more better that he's already done with the Leverkusen team right now because Bayer Leverkusen has got some good players with great abilities and the level of team woej they have got can only be compared to the team of Napoli last season that got them the league title.