I think it will be a match week where all three teams will win. Of course, Real Madrid will have a very difficult match because they have to rest their players for the Arsenal match. If they do not rest their players, they will not be able to find that little hope in the Arsenal match. If they do not take the field with their main squad, there is also the risk of losing points. Of course, Real has a very good squad, but small teams can always be challenging.
Ancelloti will not take any risks in this match and I am sure he will not rotate players at the start of the match because this is also a big match that they need to win in order to get full points. Real Madrid are in a bad form because they have had some bad results in several matches so in this match he needs to field the main squad in order to maintain the chance of getting three points. While the other two clubs will probably get full points because they don't face many challenges at the moment although later they will also experience a little difficulty.
How important playing against Alaves compared to facing Arsenal three days after playing tomorrow. The risk will be for him not starting all key players, it is not compulsory that you win some relevant games with key players only, there are still better players aside from the usual first eleven who can help the club beat Alaves tomorrow. I know some key players will begin, but we will see some stay resting to face Arsenal by wednesday. Real Madrid needs their full squad in action against Arsenal, they need to subdue the threat by equalizing three goals within minutes in 90 minutes against a club with the strongest defense.