Well, I understand how some cats do better being the king or queen of the household, but for Maddox, him being a very social (and vocal) outdoor cat, I don't think he would mind having his girlfriend around. Only thing is, he is way more domesticated than she is and I've never really taken in a stray like her that wasn't a kitten.
We have a white turkish angora (green eyes, not blue or half and half) named Kit Kat at my moms. She is our first family pet and she's still holding in at a long and happy life of 21 years and counting. She has never exactly been considered... "nice" lol. She would chase my friends around the house to the point where they would be up on the chairs in the kitchen, screaming for me to come tame her haha but she's a sweetheart to my family members and I, especially when she's hungry. Now that she's older, she's got arthritis so she just tends to lay down and relax. Since my sisters and I have moved out, Kit Kat now has her own bedroom where she doesn't get disturbed by our guests or dog. Our pup is around 8 I want to say(?) so she's still got lots of energy to run around, bark, eat and poop.
The first time we moved, I adopted a tabby mix and named her Carbon. In the beginning, she did notttt like any other animal. She was not happy being around Shelby (our dog) or Kit Kat. Carbon and Shelby have since become the best of friends with Kit Kat still reigning in as queen of the castle. <3
My sister since took Carbon to her apartment where she also adopted another kitten and named him Roman. Ro-Ro as we call him, is not neutered and Carbon is not spayed and there was a recent mishap where my sister thinks Carbon may have gotten impregnated but we shall see! I may be getting kittens shipped to me from Ohio! lol (nottt likely

no need to freak for people who don't like flying their animals) But I miss Carbon like crazy. Not exactly the nicest thing, though. She has spunk that most people would send her to a shelter for.
I know for a fact that if I brought her down here, she would not get along with Maddox AT ALL and she would probably beat the crap out of him, even though he is like... 3 times her size. For whatever reason, Carbon just kind of stopped growing lol. She wasn't the runt of the litter. She was actually the first born and the biggest kitten out of them all so I'm not sure why she's still so little.
Carbon and I from 2010-ish (only picture I could find, showing her size compared to me)
Carbon, again.

I'm also not sure why she has long fur on her tail, back legs, belly/lower back and around her chest/mane but her torso and front paws is short haha. I always thought that was funny.