Benzema has always been a differentiator in the Real Madrid squad, his fine finishing giving Real Madrid the advantage to take the win over their opponents. Ancelotti must maintain Benzema condition to stay fit, he must not be forced to continue playing because he has suffered several injuries this season.
The difference of three points from Barcelona is not something bad for Real Madrid, their opportunity to take over first place is very open. Real Madrid must focus on their goals by maintaining their best form, losing points to Barcelona will give Real Madrid an advantage.
this season, Benzema has often been hit with injuries which have made him have a little problem developing his best game. But his quality as a striker who is thirsty for goals is still a frightening specter for the opposing team. After delivering Real Madrid to victory in the match against Bilbao this week, Real Madrid has again shown quite strong competition in the title race this season.
Indeed, as you said, Ancelotti must be able to take advantage of the conditions and time to play for Benzema in every game because he has often been injured. but I admit that ancelotti is more than just a trainer for benzema because he already understands enough what he has to do with benzema because in the Ancelotti era karim benzema was able to show his best quality.