So far, I think it’s safe to conclude a few things:
1) PP wanted Tamara and Greg to destroy SB by triggering the failsafe.
2) Henry would have survived the failsafe because he was born in A Land Without Magic, but everyone from the EF would have died.
3) PP wanted Henry for some greater purpose (possibly PP wanted the heart of a true believer).
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy