THEORY! (After watching it again.) If you hold someone’s heart, you can control that person, as we saw with the Huntsman and Aurora.
Cora’s got the dagger, so she can control Rumple when he gets back. But if Snow has Cora’s heart, she can control Cora…
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Keeper of Belle's Gold magic, sand dollar, cloaks, purple FTL outfit, spell scroll, library key, copy of Romeo and Juliet, and cry-muffling pillow, Rumple's doll, overcoat, and strength, and The Timeline. My spreadsheet: https://drive.google.com/file/d/0B6r8CySCCWd9R0RUNm4xR3RhMEU/view?usp=sharing