The main player that Ancelotti played in the match against Real Betis was just to keep players fit to face Liverpool in the Champions League. Karim Benzema and Vinicius Junior did not play as usual, they lower the tension of the game to avoid injury. The presence of Real Madrid's main players is only to keep the muscles from stiffening, Real Madrid's priority is not Real Betis, but Liverpool because the Champions League trophy is more important than the domestic league trophy.
Still, Betis is easy enough team for them to win. I mean there is a good team at one hand even with their bench players, and another team who are not that great and playing at 100% with whatever they have, this is why we have draw. I would have expected Real to easily won, even if they were taking a break and relaxing and all of that, they should have been something that was easy for them to win.
In any case, if Real took a break and they are feeling better, that is good and I am hoping that they would be playing with their 100% in the UCL game, that would be a lot better and they would have a chance and even if not at least they would give us a good game to watch.