No? How the hell did you come up with that interpretation?
Square Enix has shown no reluctance in portraying Sora and Kairi as the lead couple of Kingdom Hearts. It's been that way since KH1, but ReMind was especially clear on this topic. That doesn't mean it's the best ship, or that you have to embrace it. But SE has never portrayed the topic as "Who will Sora end up with? It is a mystery."
Namine and Roxas didn't interact in KH3 because Namine barely interacts with anyone in KH3. They decided to put off bringing her back until the very end, resulting in no developed relationships for her.