They definitely exist, yes.  Possibly most of the branching Kelthams identical to him as of the moment of getting on the airplane, are still alive in dath ilan.  People were saying that they couldn't think of any better explanation for what took out the left wing besides a meteor strike, and there's no way he could've been precisely quantum-entangled with a strike that precisely pessimized as of getting on the airplane.  But that is not what Carissa is asking about, not in the most important part.

"Nobody's hit him with an Owl's Wisdom yet.  He still has a dream, he's energized and pursuing it, that counts for a lot."

"When he gets older and realizes what's actually going on in his life, he might be less happy then."

"But - there's always the Future.  For everyone.  Except this version of Keltham, who is very rare, and even he - got you, and Yaisa, and the Project.  And someday, if Golarion can make its own version of Civilization, this place's own Future."

They definitely exist, yes.  Possibly most of the branching Kelthams identical to him as of the moment of getting on the airplane, are still alive in dath ilan.  People were saying at the end that they couldn't think of any better explanation for what took out the left wing besides a meteor strike, and there's no way Keltham-who-boarded-the-airplane could've been precisely state-correlated with a meteor strike that precisely pessimized.

But that is not what Carissa is asking about, not in the most important part.

"Nobody's hit him with an Owl's Wisdom yet.  He still has a dream, he's energized and pursuing it, that counts for a lot."

"When he gets older and realizes what's actually going on in his life, he might be less happy then."

"But - there's always the Future.  For everyone.  Except this version of Keltham, who is very rare, and even he - got you, and Yaisa, and the Project.  And someday, if Golarion can make its own version of Civilization, this place's own Future."