The four man midfield is benefitting Gavi more than anyone else.
FDJ and Pedri had multiple MOTM performances in 433 this season... Both of them being MOTM in number of roles also. Gavi not had one even top game in a three.
This idea it benefits FDJ and Busi is usual shite.
FDJ can play in this same role in a three man midfield going box to box, supporting as a second DM or covering for a FB to get forward depending on what team needs.
Any coach in their right mind has FDJ and Pedri as first two names down in midfield whether three or four mids on park.
Best chance Gavi has is if the three is FDJ and Pedri deeper and he is in at AM.
Then if had attacking right back could go Dembele left and Raphinha and at that AM type wide role Gavi currently plays on other side.