De Jong is best in the world when he is playing DM and oponents try to take the ball from him.
I wonder for have many years we will need to sacrife this guy for Busqets who didn't play world class game for years.
Soumare seems good on video , but also not great control. He would be improvment because our midfield is shit.
Soumare has something very similar with Upamecano. Both of them are attacking hard the opponent(s) and in a controlled physical battle, very often they got the ball in their possession. Camavinga is also good player, but same as Ansu Fati, he needs to grow up and gain some muscules. Maybe in 2-3 years he can be ready for a big teams, but as of now, Soumare is the better choice.
If we have this defensive line: Semedo - Pique - Upamecano - Alba, we can easily post in front of them F de Jong and Soumare as a defensive midfielders. The next line will be formed from Trincao - Messi - Dembele/Griezmann and Lautare as a striker. This 4-2-3-1 system looks a little bit defensive, but with active wings , Leo as a play-maker and a striker like Lautaro we can have a lot more success in Europe than with this current squad. And, I think new coach will be needed because Setien is no different than Valverde in regards of using club de amigos veterans.
I think we can afford to sign 3 new players if Bartomeu manage to sell/loan some of our players.