Schneiderlin is a complete non-entity.
Put Gana in front of the defence - with the specific task of sweeping up and regaining possession/stopping counters, and he's a hell of a player. He is wasted further forward.
You then have a few options how to play ahead of him.
Either a big, powerful box-to-box midfielder, or a more quick-footed 'playmaker'. Ideally, we get a player who can combine both, but they are extremely rare (which is why if there is even a sniff of Dembele we should be all in for him).
And no, before anyone suggests it, that player isn't Gylfi imo. He can get on the ball in the final third and cause damage, but he doesn't run a game. Regardless of his price tag, it's never something he has done.