1) I meant it was 'debatable' as to whether or not T'Challa and Ororo are currently together, which according to the most recent comics that just were released today, they are not. He's in space. She's in Age of X-Man.
2) Conjecture on your part. While I believe there were many instances of the CompleX, breaking up Ororo and T'Challa in AvX wasn't necessarily one of them. They were only put together in the first place because Hudlin petitioned for them. Once his usefulness to Marvel had reached its limit, and the sales and fan reactions weren't in favor of them, Marvel reverted to it's standard status quo of Storm as a leader of the X-Men, not with BP. Furthermore, the Disney acquisition of Fox only was finalized just weeks ago, whereas Coates has been writing his stories for years now, so I don't think it has anything to do with the movie rights. To the millions of moviegoers around the world who saw BP in theaters, T'Challa is in love with Nakia. A few thousand comic readers aren't much compared to that.
3) Of course it matters. Storm is an iconic X-Men character. BP is not. BP is part of the MCU. Storm currently is not. There will always be logistical and editorial red-tape between them. That's not the case with Monet and Roberto.