But you are just forgetting i made up this thing of giving a piece of soul precisely to explain why Home kid saves Serge and Another doesn't.
uh... wait... i am getting confused now... lol
Umm.. Kid goes back in time to save Serge, causing the split (either from going back in time or saving Serge), so it's not like the split existed prior so that Kid could be split and have one not save him unless there's something I'm missing in your arguement
Ok, here's my new theory:
Lucca finds Kid at 1005AD (just my guess). 1010AD comes around. Kid wanders around after Lynx burnt down Lucca's orphanage, eventually causing trouble to be recognized as the Radical Dreamers on the mainland by the villagers in Arni. Belthasar contacts Kid or does something through Project Kid to make Kid go back in time around 1013AD to 1010AD and saves Serge. Somehow, maybe since Serge's survival leads to a change of events, some entity preserves the timeline in which Kid eventually goes back in time to save Serge.
I said that Kid goes back in time from 1013AD because she looks ~18 in the game, so 1005-1013 is 8, and then 1010-1020 is 18. However, I guess she could go back in time from 1023AD (being 18), saves Serge, then once again time-travels from 1010AD to 1020AD.. that'd make the most sense, since Serge I think is supposed to have memories of Kid (looking 18, if that's what that scene is where she reaches out her hand)
Can someone confirm when the panther attack was because, unless I'm mistaken, Kid was 'born' when Schala made the electrical storm