Lets consider this:
Things we know:
1) Rumple’s doings for others ALWAYS has a “way out”. If the task is not specifically stated, he will do whatever he wants by exactly sticking to the technicalities the task was stated but doing what is to his advantage.
2) Rumple created the curse as stated in episode 1×22 , not Zelena or anyone else because he would need the heart of the thing that is loved the most by the enactor of the curse. Bae was his, so he had to have someone else enact the curse who was willing to pay the price.
3) He created a love potion containing the hair of both Snow and Charming that he put in the curse as a “safety valve”, a way to prevent himself from becoming totally under the spell as everyone else would be.
4) We don’t know what happened with his dark powers when he stabbed himself through his father. If the dark one could stab himself and “break” the dark one curse, the beggar(Zoso) in the beginning of the series would not have needed Rumple to kill him to release Zoso from the spell.
So…. is it possible that perhaps
1) Rumple still has his memories but may be “pretending” he doesn’t.
2) WW took what was left of his curse (?) and made it her own not realizing she didn’t know all the hidden pertinent information about the curse including his “safety valve”: Emma
3) He knows what WW wants to do. He knows because he originally made the curse, knows how it’s made and he knows the only way to break it is true love, which Emma has for her parents. WW did not originally know this which is why it took 4 months for her to send Walsh to Emma.
4) Even though WW has the dagger, she may not have “total” control of Rumple probably due to the way he “died” – hence the method he is using to prevent himself from being completely under control of WW. His magic may be under her control perhaps to a point, but his mind is not. He may be “technically” following her directions, but in a way to his advantage. He knows what is at stake and what needs to be done to “undo” WW – the savior.
5) Emma was able to resist Cora’s dark magic, so does WW know that Emma can resist and overpower WW’s magic? Did WW find out about the savior (perhaps from the curse or somehow intercepting the directions to Hook) and sent Walsh to monitor and prevent Emma from remembering and coming back to Storybrooke?
6) He sent the potion ingredients to Hook, directing the bird to find him (like he did his shadow) and deliver it to Hook – OR perhaps sent it to Bae who sent it to Hook (Unsure about the potion/potion ingredients – Hook makes conflicting statements. – is he a monkey now ????)
On another note: Are Snow and Aurora’s babies destined one to be a boy and the other a girl that may either have powers like Emma or will eventually fall in love and produce a second savior? Both are products of true love. Is this why WW wants both of the babies?
Don't grow up. It's a trap.