The midfield is garbage. We all know it. They don't protect the defence adequately, they don't supply the attack adequately and they don't control games when we need them to.
On paper, you could see why an incoming manager wouldn't think it was the biggest priority in the squad. Gana probably has some of the best defensive stats around, Schneiderlin's passing stats are good, Gylfi's generally well rated as a no. 10, and then you have kids pushing for a place in Davies and Dowell.
So you can see why a manager would think 'I can work with that, I'll try to address the awful defence and buy some more attacking options as an initial priority'.
But yeah, the midfield doesn't work, and never will with these players. And they're not bad players, any of them. The balance doesn't work, and they don't compliment each other at all.