This change seems to have been made to make Zo as their father a possibility, it serves no other purpose.I said before Zo can't be the father of Alexis and Layla, because he wasn't a pro. But I've to admit that I didn't recognized that:
So, after these changings it's absolutely possible that Zo is their father and I think Nyx changed it because she saw this dialogue between Layla and MC is misleading.
From now on I'll be on the "Zo is their father!" side and take back what I said before.
Ooof Andres as Elena's dad would be rough, i hope he isn't.Before it didn't make any sense that he was the father, it was all very confusing. Now all that's left is to find out Elena's father. And with the amount of male characters there are and how twisted Nyx is, I wouldn't be surprised if it's Andres. Leaving Ava alone to go out with Emily.
Despite my personal dislike of the idea, i admit that timeline wise this theory can work.