Board Thread:Spoilers!/@comment-25926288-20160723224038/@comment-7345267-20161024062734

Hmcooper4 wrote:

Emma was not just the product of TL, because otherwise Neal, Philip, and Alex would also be uniquely special. Would they, tho? I never got that idea. It always seemed to me that Emma was not only the product of TL, but Rumple's use of that tL (in his making a potion) as well as the extraordinary circumstances around her birth made her special.

she was marked to be a "savior" before birth, in a way that no other child was.