Karim Benzema means more to Madrid than just being a striker. He might haven't scored too much, but his impact on the team's attack is undeniable. However, there's no player Madrid couldn't replace, especially with the pool of young talent they have. Now they need is a goal-scoring striker who score goals. Though a replacement is possible, but there's a significant gap between a good striker and a truly exceptional one.
During the pre-season tour, Real Madrid is looking quite different and weak side. Of-course just friendly matches, not official ones. As new season around the corner, there's hope and expectation for improvement.
You are right, Karim Benzema was not just a scorer. He has played an important role in the overall performance of the team. He used to support the players. At the same time, Madrid's young players would have been more confident if Benzema was in the squad. They get motivated to perform better. At the same time, if Benzema was in the squad, the bond between the Madrid forward and the midfield would have been stronger. This is why replacing Karim Benzema is not easy. Ancelotti needs to add talented players to the squad, as well as bring about changes in match tactics.
I think it would have been better if Benzema had stayed at Madrid this year. After Benzema left Madrid, Madrid could not find a quality player to replace him. They transferred Joselu, but I don't believe he will fill that void. It could be a very good example for young players.
It would certainly be great for Madrid if Benzema stays with Madrid this season. But Benzema knows very well, if Madrid gets a suitable replacement for Benzema, then Madrid would throw Benzema away. And so Benzema did not take any risk. He has received good offers from Saudi clubs. This is why he is with the club in Saudi Arabia.
It is difficult to find a suitable replacement for Benzema. Joselu is really talented. There is no doubt about it. Because in the last season he was third in the list of goal scorers of La Liga. He is quite talented. However, he may not be able to contribute to Real Madrid's performance like Benzema. However, if he adapts to the Madrid squad, he can contribute to the stability of Madrid's performance.