You right.
We don't know much about them......actually we know nothing at all. They don't even Talk or voice their own opinions.
We know why Bast left, but not why the other Orisha's left.
And that's the thing we may never know. And i'm afraid it may be the same for Hadari Yao he may never touch on that topic again. Or he will be as Vague as he's been with the Orisha.