IMO JOB is a better right back than centre back and will play there by default. My suspicion is Moyes agrees. Lots of CBs get converted to full backs these days. He is only 'out of position' in so far as his FIFA card still calls him a Centre Back.
What is McNeils position? Played LW, RW and 10 across his career. I suppose you might say his best position is LW, but he can do a job across the lot. He isn't starting for us anyway so its a moot point, he'll come off the bench and offer competition across the front line
And I would agree that on paper we didn't need Grealish (in so far as we need a natural RW) however I would argue that we needed better quality in that forward line, either winger or 10. McNeil, as much as I like him, is not good enough to be an Everton player in the long run.
We'll still get a natural RW (hopefully left footed) anyway but, if we assume that it's the most important target in the window, and will be our record transfer, I'm fine if it takes until the 11th hour to complete. Ndiyae will play out there in the meantime