What you said is very logical for Real Madrid and also for Ancelotti to think carefully as the coach of Real Madrid. Because previously Real Madrid also had better reserve players so that their performance was not so affected when their main players were injured. But for this season it seems to be a bit different so Ancelotti needs to find out where the problem is and try to solve it as soon as possible before Real Madrid really loses the chance to become champions again this season because they are late in fixing the problems that are happening in the team.
This season's journey is still very long and I think Ancelotti is a very experienced coach so I am sure he will be able to solve this problem and even last season Real Madrid also experienced the same thing and at the end of the season they were successful. Although this season is different, Ancelotti's experience makes it possible that he will be able to solve the current problems and there is also news that in the January transfer window Real Madrid will bring in new defenders because of the many injured players at this time, so there are many opportunities that can be maximized by Ancelotti to fix the existing problems.