It does seem bizarre that you could become a savior by murdering a savior. I don’t think that makes any sense at all. The saviors are supposed to be good. Does that mean that if a villain kills a savior, like if Jafar succeeded in killing Aladdin, would he then become a savior even though that was not their intetion? That makes no sense at all. There has to be something else to it.
Yes this is one of my complaints/queries. Their “method to make a savior” is so fly-by-the-seat-of-your-pants that it doesn’t make a lick of sense.
Emma is born of true love and was made the Savior of the Dark Curse by Rumple.
Aladdin seems to be “The diamond in the rough”/a thief with the heart of gold that somehow bestows Saviorhood upon him. (This, for me, is the weirdest of the bunch)
And now Gideon thinks he can kill Emma and become a savior which makes *some* sense because of how intricately tied the Dark One’s curse/blade is to Excalibur, supposedly the sword of heroes.