To befair, we don't know (iirc) if they're limited to the Milky Way or have expanded further which might increase the odds of a recurrence. Also, I'm not sure why you're limiting yourself to within Seraphi's lifetime?

But yes I meant that there's a protocol for adding recurrences in wills because it's happened before, not specifically that Seraphi's recurrence had happened before.

I got the impression that the Entitled are few in proportion (say, 1%), but their absolute number would depend on how wide this universe is, which I don't think we've any info on.