Board Thread:General Discussion/@comment-10745887-20151001044421/@comment-26184894-20151001084457

First curse- Emma had to be the one to break the curse because rumple manipulated her parents true love so that it would be apart of the first dark curse. And it couldn't have been the charmings because they didn't remember each other(not who they really were).

Second curse- the plot demanded Regina use TL kiss so she could have the strongest brand of light magic and defeat Zelena. There is no reason why any other TL couple couldn't have broken that curse.

The only reason the dark curse couldn't be broken with TL kiss is the memory wipe, but if it's not wiping the person entire memory of their true love then I don't see why TL kiss couldn't work