I’m guessing the Guardian actually has something to do with the big bag monster we saw at the end of S6 in the flashforward (I maintain it’s a flashforward to life POST HH and not a flashback). Which still makes it seem like it’s either Henry or Lucy which would make sense given that Henry and Lucy are a Emma/Henry stand in from the first six seasons. One was the Savior and one was the Heart of the Truest Believer.
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"He was a lot of things to me" "The only conclusion was love"