Whether she asks people to address her as Master or not is her choice. As to some of the other, younger ones... [His tone becomes a lot more solemn.] ...It seems they weren't trained by proper Masters to begin with. I'm not surprised they didn't know the formalities.

Yes, technically. [Again, his tone is somber.] ...I was training Ventus more thoroughly, while he was still here. As for the others, proper training normally takes many years. It's not something that one can enter into on a whim. [Basically, he'll train if asked, but he's not going to offer, because this is not at all a conducive learning environment.]