That's the jist of it. Of course, there are those who suggest that Rinoa is in fact Ultimecia, but there's isn't much that can back that up to a very plausible level, so generally your take is considered correct.
Yes, I'm certain she is Ultimecia.
Yes, but I have strong doubts about it.
I haven't got a clue.
No, but I have strong doubts about it.
No, I'm certain she is not Ultimecia.
That's the jist of it. Of course, there are those who suggest that Rinoa is in fact Ultimecia, but there's isn't much that can back that up to a very plausible level, so generally your take is considered correct.