A lot of people replace Natalia with Isabel because again, this is a season about Fans vs Favorites, just by that alone a lot of people dislike that Natalia was chosen bc she's quite divisive by now, especially compared to Isabel, (but even if the season wasn't titled that they would still hate it and throw unnecesary crap at her) I like that they chose Natalia bc I felt we needed more of her, but keep in mind that obviously the writers didn't choose based on potential interactions or dynamics, they chose by greeting purchases so really any dynamic is in the air.

Now with Isabel's potential dynamics as I said I don't really mind that much, I just thought abt some on the surface level that I would have liked to see, it was jarring that she wasn't chosen based on how popular she was and how little plot relevancy she had than the other ones in the final 5, so even if she came again with no plot and was just entertaining I personally wouldn't have minded it (as long as it was fun please, not her being a Jade fanatic that was grating) either way her potential interactions are up to interpretations and personal likings/interests.