Obviously positional sense and defensive awareness, when to press, where to be off the ball etc is something that can be coached and improved with game time and experience. It’s not something that happens overnight though.
With Alcaraz, I rate him but you can see the side of his game he needs to work on is out of possession. A coach like Roberto Martinez doesn’t care so much about that for his central attacking midfielder it’s more about what they can do with the ball - I tend to think similar. Moyes does care about that though, he wants a solid shape out of possession, particularly through the middle of the pitch, always has.
Pre season game in Scotland, can’t remember who it was against, all you could hear was Moyes screaming at Alcaraz where to be without the ball. Rightly or wrongly, just don’t think he trusts him fully but I do think he’ll get his chances this season.