You're likely right but do you think he brings enough to be in the team ?To me they add all something different, Sissoko is like Ghetto Prince a more attacker b2b, Pogba is a playmaker, Matuidi is your classical b2b player & Capoue is a dm
I think the 4 are just variations of the same position and a Cabella or a Cabaye fits in a different one and therefore brings another weapon to the team while a Sissoko will just mod an existing one. But that's Deschamps, since Marseille, he relies on a strong midfield and a double pivot so I won't say that what he does isn't logical regarding his past.