Well, you say paid massively over the odds for a player we didn't need in schniederlin.
...go back a few weeks before Davies truly announced himself, and one thing Everton were crying out for was a centre midfielder to parter Gana. Someone to take over from Barry, of whom you consider one of our most important signings in x amount of time... Be it now, or when Barry's time is up. (Games catching up to him when he plays every week)
We are likely to ditch a couple of the baddies, i.e. Clevs, Gibson etc - Schniederlin is an insane improvement. Not to mention he's got his best years ahead of him, and if we make Europe then we need a squad that isn't full of dross to cope with it.
But ok, I agree sigurdsson would have been a good signing, but I guarantee we would have had to 'pay massively over the odds' for him and he would've just displaced Barkley without really giving him a chance to improve.