Yes, it is true. We cannot deny that Real Madrid can survive as a big team in La Liga because they have strong defenders and Midfielders. If Ramos and Marcelo leave the team, also Modric to be sold then, it is a big problem for Real Madrid. As a team, a strong striker will be nothing if they have weak defenders and midfielders. I think it is better to sell other players who mostly spend their time on the bench. For example Jovic, Vázquez, Díaz, or Fernández.