Yes, exactly so.
Because that's the closest possible explanation they have for her existence, but she isn't really a Nobody, as she doesn't have a true Body and Soul.
And i pointed out how they do when it comes to empty vessels or extremely powerful hearts, which justifies why Roxas looks like Ven.
Of course it could, and that was the explanation most people had before Days and BBS came out when it was revealed that it was actually because he had Ven's heart.
The problem is that it's not even a mystery anymore. BBS was used to SOLVE the mystery of why Roxas looks like Ven, along with Axel hinting he had a heart, him fainting in CO when he got close to Ven, him dual-wielding. I mean, the games are practically screaming this at you, and it's just shy of Nomura popping on the screen and saying, "look idiot, he has ven's heart".
It makes me feel a little bit better, plus, in the case of the latter, it's definitely the truth.