The presumption here is that for a poly relationship to be healthy, you have to feel equally strongly for everyone in it, which isn't the case if everyone is still getting what they want out of it.Maya words where "I never been this comfortable with Josy" then she realize how bad it sounded and try to blame it on Patrick. How is this a odd argument this is massive confessing from Maya. MC and Josy aren't Maya parent they her partner if your more comfortable one with one over the other your going to have a deeper relationship and just stronger love for that person. This is a big red flag
If Maya wants that level of comfort with Josy it may be something she's become aware of now and needs to work on, or at a minimum become comfortable with where she's currently at. But it's hardly a death knell, unless DPC wants it to be.