yet the original heart still holds the key...thats what im saying. he is still "braig". Braig and Xigbar are the same person, period
its pretty obvious they're not a different existence.
I don't think using Braig is helpful, as he is part Xehanort, like Isa.
Lea is the perfect exemple of "non unfluenced" nobody that ended up being exactly like his normal self. And once he became human again, he indeed was acting just the same.
Though at first, nobodies are "blank page" that can be influenced, that's why all of them ended up evil, because Xemnas lied to them and manipulated them.
Most of them were defeated before getting their heart back, that's why "Zexion" was evil, and the newly reborned Ienzo isn't.
edit :
By blank page I mean neither good nor evil, not like Roxas's total blank. I mean, it's been hinted Xemnas is responsible for most of their behaviour.
We have no confirmation yet however if Braig really returned to being human or if "Xigbar" is still around because of the very advanced Xehanortification.
Well Isa is the complicated case, but Braig was already becoming a Xehanort before the incident. (he is the "seed" MX was talking about)
So in his case I don't think it matters in anyway. Let's just assume he came back as human but it didn't change anything for him.
As for Isa, we'll know more about it when Lea confronts him ! I doubt it's as simple as Braig... Might be closer to Terra's fate ? Though in his case, I think the nobody was turned into Xehanort, not the human, so that's interesting...
I'm also interested in weither Terranort is back or not (because of the time travel, it makes it hard to believe how he could be back, because xemnas and ansem are there, that means they're not destroyed in the past, and if they took Terranort from the past, it would render Ansem SoD's time travel impossible in the first place).