So every single card in the set will belong to it's respective number in the original sets. I hate the alternate art thing Pokemon is doing now. Either release it with the original sets or not at all. Sun and Moon has made the company greedier. "Here, have alternate arts", "here by the full-arts of cards that were in that one set in this $40 box."
This is where the downfall begins, just make sure we remember this is where it began and where we were to see it.
I disagree that the alternate arts are a negative thing. You're right, it means more product, but since they aren't promos and don't affect the meta it just means we get more cool stuff. the alternative is here, Japan still has cool stuff the rest of the world doesn't get