She doesn’t know him pre-Dark One
Could be this. Emma might be able to rip out his heart and force him to do things. And she can threaten Belle if he does not comply. And we know, apparently that Rumple is powerless now, without ANY magic, So yeah, I guess he is the easiest to manipulate.
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"I could have the giant duck as my steed!" --Daniel Radcliffe
Keeper Of Tamara's Taser , Jafar's Staff, Kitsis’s Glasses , Ariel’s Tail, Dopey's Hat , Peter Pan’s Shadow, Outfit, & Pied Cloak,Red Queen's Castle, White Rabbit's Power To World Hop, Zelena's BroomStick, & ALL MAGIC