Agree. Gana is an elite ball winning defensive mid. Keep him there.
My concern is that McCarthy is not a good enough box to box guy, either. He's also more of a DM or a 6. Wants to hold the ball, pass it backwards and sideways. Davies is a bit better, runs with it, but he's almost better playing the creative final ball. McCarthy to me would be Gana's backup or partner if we played two DMs. Doucoure is MUCH better than either. He gets the ball and he's gone. We really don't have that player, although we've asked Gana to play it. Rooney roams around and can play it a bit. But you put Bolaisse wide, Siggy, Rooney, and Tosun who has good movement out there with Doucoure to move the ball quickly and efficiently, you've changed our team.
But again, if your left mid is covering for your left back for 90 minutes, no number 8 is going to have as many options as they should.