Yes i saw, it's not that i like a 4-man defense very much, it means that he's putting all the effort into a defense rather than into the midfield for example.
I liked Carlo Ancelotti's game, so let's see if Xabi's works, we'll find out next season.
Xabi seems to adjust the formation used with the available players. Xabi in Leverkusen more often uses 3 defenders and 4 midfielders, which makes Leverkusen's type of game with dominant ball possession.
But it seems a different pattern is applied to Madrid, who have stronger players in the attacking game pattern. We have not seen how effective Xabi's method will be applied for next season. But hopefully, there will be no problems with the players and the playing style designed by Xabi.
Xabi is an experienced coach and I feel that he has been able to figure out that if he uses same formation he used at Bayern Leverkusen for Real Madrid, he may not actually get the result he wants that is why he is using a different pattern but maybe we can wait till next season to see the formation he will prefer. He is coaching one of the best teams in Europe so he will certainly use a different formation that will match the club's style of play. Xabi Alonso has already proven himself at the FIFA club world Cup, despite Raul Asencio getting an early red card in their match against Mexican team Pachuca but they still managed to win by 3:1 and are leading the table of their group so it shows that next season will be a smooth one for Xabi Alonso even though there will be a tough competition between them and Barcelona.