If they sleep in the close presence of each other that would be a good sign to my opinion.
I think I would now no longer make a lot of circumstances.
Give Nakita all the attention she needs. Phoenix is less complicated she will see that she gets what she needs.

Tigris sometimes bullies my little dainty Filou (you know , Momma's boy ) and I always go to Filou and comfort him telling him he's the sweetest etc. etc. because I know he needs it. Tigris is just a big friendly hunk of a cat and even after you told him to leave Filou he jumps up and cuddles with you- so I care for the more sensitive and love the other one nevertheless