I find it a bit odd that people want Alonso to consistently produce good results (winning trophies) before he can be called a good coach. I mean, if his achievement with Leverkusen is just "lucky", then how would you judge his competitors? I guess every manager is terrible nowadays, which means a club should pick their coach randomly if that is the case. No point analyzing a coach's profile as long as they can get a bit lucky once in a while. He's probably not the next Guardiola, he won't have as much leeway with buying players, and he doesn't have to be one. Then again I guess he doesn't care what people think of him, especially if the club and the fans are happy with him.
Are you talking about Xabi Alonso or Vincent Kompany?

Xabi is a good coach so far, he managed to make a team that had never won the Bundesliga title get it even with a questionable team composition. For me, his achievements are the result of luck meeting the right time, when they won the Bundesliga, Bayern Munich & Borussia Dortmund were in chaotic form, just look at second place in the standings, is it Bayern Munich or Borussia Dortmund? no, it's Stuttgart.
There will be no more Bundesliga titles for Bayer Leverkusen in the future, no more.