That applies to Barca B as well. I just named you the 3 most productive players. Balliu, Gustavo, Lomban, Araujo, Deulofeu, Rafinha, S. Roberto, Luis Alberto. None of them are playing for Barca B anymore and they were all around 30 or 30+ cap players.
Many of your team is still there... you still have Masip , Planas , Dongou etc
this is practically a new team for Real with the exception of Borja ,
the quality that left is much bigger than yours too
Jese , Morata , Alex (Espanyol ) , Fabianho (Monaco) , Casmeiro , Nacho ,Cheryshev (Seville ) .Mosquera (Getafe), JuanFran (Betis) etc among others ...
You are talking about a different level of players here