Not all midfielders can play in all positions, or indeed in all combinations of other players. I would see Mo and Kenny as players that like to occupy the same position. Vrancic can play higher, in the Stieperman role, I think Todd was a number 10 originally, but it is odd, as Stieperman is almost a false 9 rather than a 10. And basically we don't have cover for Emi, I certainly wouldn't see Mo as a direct swap. And all this really ties in with the philosophy that we are trying to instil, about having players to suit the system, Farke is doing his best to maintain the system, with the minimum of disruption. And to bring Leitner in you would have to drop Kenny (Who actually likes to play higher up the pitch and has played as a 10 before) but also bring Todd in, changing two players and causing greater upset to the overall dynamic.25 points with Emi I agree, but why leave some of our best players on the bench when we are forced to leave him out. If DF thinks Mo is the best midfielder in the division, what the hell is he doing on the bench? Cantwell seems a shoe-in for Emi, yet has little creativity which surely a manager would be trying to replace. There seems to be almost a fixed order of players coming in if someone is banned or injured in midfield which mustn't be altered. God knows where Vrancic and/or Leitner stand in that.
No idea where Tettey and Thompson fit in any more!