I never doubted that symbionts are persons. If they are not joined they swim in those pools and communicate with each other. If they "talk" that means they have something to say.
I just wonder if a symbiont can return
to those pools. It's said it has to go into a new host within 48 (?) hours, but can't it return to those pools? Could they offer the same chemical balance that a new host would?
If not, being joined is a point of no return. It is the same case for a host, but hosts don't live hundreds of years.