Cetras not gone?

So, because they may have reused a character design for two relatively unimportant characters, the Sage is a Cetra, since the other one definitely was? Makes sense to me.

I'm sorry, but how the hell could he forget something like that? It's like me forgetting that I am a human.

Jenova was NOT a Cetra. Jut because she can trick people into thinking she was one does not make her genetically so.

Where does Priscilla give any indication that she knows about the lifestream?

Here's an excerpt of the game script, lightly edited to remove a conversation about Rufus, CPR, and a discussion of who was going to climb the tower, in which Priscilla doesn't speak:

And shortly after:

No mention of the lifestream, unless you can show me another place were she could have mentioned it. Her name did not appear any more times in the script, and I don't remember ever seeing her again.

 

So what exactly is it that she says? That the lifestream gushes up out of cracks in the ocean floor near there? If that was all it was, she could've read that in a book, or heard about it from anyone.

So the Sage is an idiot. But so forgetful that he can't remember that he can speak to the planet, that he's different from the rest of the people out there? Doubtful.

 

So? Plenty of people are hermits. That doesn't mean they are so stupid that they can't remember what species they are. The Cetra have a strong link with the planet. How would the planet allow him to forget that?

So, Tifa tells her that Cloud became lost? Red XIII makes the same leap that Cloud entered the lifestream, and that there are places on the planet where the lifestream reaches the surface, so it is likely he washed up there.

And whatever, maybe the dolphin has given her tours of the lifestream. Just the fact that she knows a little about it doesn't make her a Cetra. Sephiroth traveled the lifestream and absorbed its knowledge. He wasn't a Cetra. And the fact is that Aerith met this little girl and didn't make one tiny, offhand comment about her being another Cetra.

 

And I think he would have been more likely to blab the fact to people who could potentially hurt him because of it, like the Shinra, than to actually forget about it.