I might be wrong but this is my theory of the whole xehanort saga of kingdom hearts.
remember back when you first got the first KH and probably thinking who is the ansem guy FF characters are talking about and when you found out that he controls the heartless he was evil and you have to kill him to finish the game and wondering why Sora stabbed himself well we know soon that Ansem possessing Riku that Kairi's heart is within and only way to release and for the keyhole to be complete he had to stab himself to release her heart also which make Sora disappear but Kairi said she won't let him go so bascially he came back as a heartless and Kairi sense it was Sora so she protected him and obviously that made him human again.
and Chain of Memories came out and confused probably the crap out of you, you are like who is this organization what do they want and was wondering who the blonde girl was and the old guy in rikus story too.
Then KH2 came out and your playing some guy you dunno i bet you all thought Sora was gonna wake up at the beginning but we were wrong we played Roxas and thinking who is this guy and why was he having dreams about Sora till we found out he was Sora's nobody and he was once part of organization and thats why Axel was sent on a mission to bring him back cause Roxas was the only one in the organization has the power to wield the keyblade and he was the one to make Kingdom Hearts happened.
and your all thinking he can wield the keyblade cause he holds half of Sora's power in him also his nobody and then the only way he can become whole again is to go back to Sora so he can wake up so basically Roxas was inside Sora throughout his second journey and why suddenly Sora starts crying without getting upset its cause its Roxas crying.
Sora teams back up with donald and goofy Mickey ask them to board a train to the mysterious tower where Master Yen Sid lives the wizard from fantasia and mickeys teacher and Yen Sid blabbed on bout they had to go on another journey and telling them bout the new enemy Organization 13 and the nobodies they had to defeat them once and all but Sora was abit concerned into finding Riku and we dunno why we probably understand that they were friends but it was something and no not yaoi ok LOL.
anyways later on in the game we reunite with King Mickey and he explain Ansem wasn't really Ansem they defeated but it was his heartless and they all like, "WHAT" i was like that too LOL just to kill off a fake LOL and the real Ansem was Ansem The Wise or Diz.
also he explained his recognize him before but dunno when then he did a flashback and it was Xehanort, Ansem's apprentice so the leader of the organization was his nobody Xemnas (mansex) LOL so after all that there was a battle in Hollow Bastion between Heartless and Nobodies and then they comfronted Xehanort but he disappeared along with Mickey Sora was still left clueless but then Axel showed up and told them that the keyblade slaying the heartless was only helping the organization to create Kingdom Hearts so they can exist then Saix appeared Axel disappeared and Kairi was kidnapped too and Sora wanted Saix to take him to her but he said no that made Sora even mad but realise he can't kill the heartless cause it was only helping them but he had to I felt bad for him :( after that
now your thinking what is this Kingdom Hearts right that this Xehanort dude was so obsessed with.
on the last world Ansem The Wise and Mickey reunite and Ansem uses a machine so Xemnas will never have his Kingdom Hearts and Sora and Kairi reunite and Kairi met Riku before that but she can sense that Xehanort's heartless was Riku and was trying to make Sora believe that and Sora sensed it and hes never been happier lol.
but they weren't finish yet they had to defeat the last 4 nobodies Xigbar, Luxford, Saix and Xemnas since Axel used his power to fight along side Sora and destroy the dusks that interuppted Sora, Donald and Goofy as they were heading to it via the virtual twilight town, the trio defeated Xigbar and Sora was wondering why he called him Roxas.
Then Sora defeated Luxford by himself and then the trio defeated Saix now it was Xemnas left they met up with Ansem and Mickey and also Ansem knew he can destroy it and the only way was to destroy himself too but Riku knew it was gonna happen after KH was destroyed and Riku turn back to normal probably when you all fangirls loved.
but before that Sora was wondering why some of the nobodies called him Roxas and Riku said Roxas was Sora's nobody and he was inside him.
anyways Mickey, Riku and Kairi joined the trio to defeate Xemnas once and for all and they think they did and we see that blonde girl again from chain of memories and beginning of KH2 who was trying to tell Roxas that he was Sora's nobody her name was Namine and shes a witch and she was rechaining Sora's memories back together at the beginning on KH2 and we are all wondering ok shes a nobody but whose nobody is she till she help Kairi break out when Kairi touched Namine's hand it was light and thinking hmm maybe shes Kairi's nobody and that scene she open a portal to the island Mickey, Donald and Goofy made it through and we found out she was Kairi's nobody cause remember in the first game when Kairi went through Sora before she disappeared her heart was inside Sora and after he stabbed themselve gave her heart but since it was out of her body she was just a empty shell so that means she had a nobody and also another part was release and we all know that was Roxas eh.
and after Roxas and Namine went back to the original forms Kairi went through the portal and Sora and Riku < who is not in the darkness anymore were bout to go through but it close up which means Xemnas ain't killed off yet.
so it was upto Sora and Riku now to finish him off.
and FINALLY they did after the battle Riku was weak and Sora helped him aww and walked onto a dark beach and later made it back to the islands and Kairi and thats when KH2 ends.
to be continue