It could save Real Madrid, as PSG immediately performed well after Mbappé's departure to Real Madrid, even though PSG still has other top players. However, this is not so evident at PSG, as they all work together in every game and never give up easily when they lose. That's what makes PSG so great now compared to the PSG of the past, and Real Madrid still seems to have more work to do, especially in defense and midfield, which is often chaotic in providing forward passes to their attackers.
I think they lack of midfielder who can give accurate passes and controlling the game, Real Madrid have too many attacking midfielders. They lack of a real central midfielder who can connect both defenders and attackers, this is the part where they're missing of.
There was an old rumor they scouted Hugo Larsson from Frankfurt, but he's still 21 years old.
I believe this is a good step that the new coach is taking. We cannot count on defense players who are constantly injured for a long time. We also need to have good, skillful defenders so that we can have a strong team in the long term. Barcelona also went through bad times when their good old players left the club, so the case of Real Madrid was also expected.
Alvaro Carreras had a good stats in the previous season, it just he played in small league.
Real Madrid really need to sign few defenders because their current defenders are getting older and their younger defenders often made mistakes.