I think that’s a very valid point Phee. I think my current theory is that Rumple displaced Henry Sr and Cora after she refused to give Rumple baby Regina AND used the dagger to make Rumple teach her magic. Once Cora had her magic and her child she probably thought she could take Rumple but Rumple got one step ahead of her and somehow H and C lost their throne (my guess is to George). Thus, Cora would never have told Henry Sr about Rumple and the trick they played.
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"He was a lot of things to me" "The only conclusion was love"