A coach will be able to bring out the best potential from a club if the club has players and a style of play that suits the coach. That doesn't mean that if you are very great as a coach at a club, it doesn't necessarily mean that you will be even greater if you coach a club with higher quality players. There are many factors such as the coach's approach to the players or how the coach manages the existing squad to be able to play with the expected tactics. I agree that Xabi is a great young coach at the moment but if he were to coach Real Madrid then it would be a different challenge.
Xabi Alonso can do that, but before moving to Real Madrid, I'd love to see him achieve something with Bayern Leverkusen so his achievements with the club will sound, talk and speak for him.
Moving to Real Madrid won't be difficult if the President of Real Madrid really wants him around. I believe that Carlo Ancellotti has achieved a lot and it's time to see him part ways completely with Real Madrid.
He's only being respectful and professional since henis under contract with Real Madrid. A move to Brazil National Team means they'll be needing another coach. Xabi Alonso has already shown he can be the next coach for Real Madrid. When you see his side ( Bayern Leverkusen play ) You'll know he has tjr capacity of managing a big club like Real Madrid. His winning rate alone this first half of the season is mind blowing!!