I think the person who got Henry for Regina besides Rumple is Wendy she could have got August to bring Henry to Storybrooke.Regina said August look familiar what if Wendy got August to bring Henry to Storybrooke also I have this theory that Wendy is Emma,s foster mom.I think Peter Pan wants to protect Henry from the Dark One PP could have heard that a boy would be the Dark One,s undoing so PP wants to find the boy and protect him so when the time comes the boy would be ready to face the Dark One it,s look,s like Rumple is afraid of PP if PP wants to protect and help Henry stop the Dark One then it would make sense why PP is after him it,s like Dumbledore and Voldemort Harry is Voldemort,s undoing Dumbledore knows this and wants to protect and help Harry Henry is the Dark One,s undoing PP could know this and wants to help this boy stop the Dark One. Also in Harry Potter Dumbledore is the only person Voldemort fears like PP is the only person Rumple fears the Dark One wants Henry dead the Dark One fears PP Henry,s best chance would be PP. No one would dare to try to harm Henry if he was with Peter Pan 😀