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.
With the depth of the squad that Real Madrid has, Xabi Alonso can freely experiment and apply any formation according to his wishes. The average Real Madrid player can also play in several positions, this will clearly make it easier for Xabi Alonso to formulate the best strategy to achieve consistent victory.
I think, if all the key Real Madrid players are available, everything will go as expected. The biggest challenge is injuries, that will make it difficult for any manager.