None of Rabiot, Arthur, or Bentancur are mids with the level to demand 100% playing time, for different reasons.
Arthur is the more encouraging one, if he can improve his fitness. The other 2 aren't better than Locatelli though. Rabiot is great at his peak but overall can be inconsistent through a season, and as sacrilegious as it might be to say here, Bentancur is still a step below all the rest. His technique still has some way to go.
4 midfielders like these are good to have so they can rotate through form, injury and fatigue. Two 22yo and two 25yo, there is a lot upside to players like them.