They could easily have Belle pull out the gauntlet and have it take her to his weakness. If it brings her to herself (???) then she would know he no longer wants power but really loves her and is putting her first.
Thing with the gauntlet though is it takes you to a person’s weakness which is NORMALLY the thing they love most. However, in Rumple’s case, he’s described Belle as giving him STRENGTH “you made me stronger” and the dagger is literally his weakness because it controls him and makes him enslaved to whoever wields the dagger. Belle is not Rumple’s weakness.
Cora subscribed to “Love is Weakness”, does Belle believe that too since she expected herself to be Rumple’s weakness?
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Keeper of Felix