Splintered Gale Incarnation might look like different people and it might look like aspects of the same person and both are true at the same time because the nature of the Primordials of which you draw your power is not limited to puny mortal understanding in much the same way as VEE's wish granting can look like it breaks causality when someone who asks for a job receives a letter asking them to start tomorrow even though the letter is dated a week before they made the request.
So is SGI a person whom you would be killing if you get killed and reincarnate? Well no, that paradigm would depend on the entity being able to exist as something other than an aspect of Molly Carpenter, there is no button marked 'let the clone loose', anymore than there is a button to make two plus two make six. Does someone/something die as part of the imperfect reincarnation, yes a part of you, but that is inherent to the themes of the Hell of Being Skinned Alive. Freedom Lets Go literally rips off a piece of your soul with a curse or transformation attached and hurls it into the depths of hell.