It's in the future plans
On your second question, external mods can impact this seemingly. I'd suggest doing another totally clean run through and trying again!
Have you played with mods for the game on your device before? If so, I think that's what is impacting this?
We always planned variations on each path. The choice of allies will be one of the longest-lasting significant choices throughout the rest of the game. You will still be able to interact with Seraphina on the demon path (you will have access to her side path content - albeit with some variations).