Xabi Alonso is a good coach but Carlo Ancelotti was a better coach with more experience that was able to leading Real Madrid to countless victories. I doubt if Xabi Alonso can continue on Carlo Ancelotti legacy, besides Xabi Alonso is aware of what is expected of him and that's to win trophies for Real Madrid,for me I don't see any pressure he's into right now because he already agreed by signing to do the job and being under pressure is just a normal experience for any coach coaching a big club. However I understand every coach has their different formation and playing tactics, maybe Real Madrid fans has to give Xabi Alonso sometimes to see if he's capable of leading Real Madrid just like legendary Carlo Ancelotti.
I don't think it make sense with this comparison now considering the gap between them in terms of number of years of coaching. Carlo Ancelotti have been a coach even when Xabi Alonso was still playing for Liverpool so he would have had so much experience as a coach, far more than Xabi Alonso which is showing great potential but have not really arrived at his best. You also remember that Xabi have not won any serious competition apart from German Bundesliga that he won. There is no point to compare them but surely Xabi will make a great replacement for Ancelotti.
Of course, this comparison is unreasonable because Xabi has only been coaching Real Madrid for a few months, while Ancelotti has been coaching Real Madrid for a long time, and Ancelotti is also more experienced than Xabi Alonso. So, judging the two current coaches is unfair.
In fact, I noticed a difference in the coaching styles of these two coaches when they were at Real Madrid. I noticed a significant change in the roles of Real Madrid's midfield under Xabi. I don't mean to discredit Ancelotti, but it seemed like the three midfielders used to have similar roles, even tending to be undisciplined in attack and defense, which often led to a lack of communication in midfield.
Under Xabi, it seems each player is truly given a different role. Aurel Tchouameni is the pivot alongside the center-back, Bellingham still plays the bridge role, and what I've noticed most is that Arda has been deployed in several different roles in recent games, having been more actively deployed up front, and Vini also seems to be given more diligent instructions in the middle. So, Real Madrid will be even better next season because Xabi will implement more varied tactics and patterns.