Wouldn’t he know, though, who “the one” is? Of course he didn’t see Belle coming, but that’s another issue.
@Storyteller was discussing this elsewhere, but we do know that Rumple’s foresight isn’t 100%. He knew it would Cora’s child and I think he assumed her first born..but obviously something went wrong. So when Cora says, “my firstborn?” and “she?” she looks ever so slightly nervous
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"He was a lot of things to me" "The only conclusion was love"