Xion's Creation...

[Key of Valor]

According to Ansem, a Nobody wasn't formed on the night of the storm.
Also, his reports state Namine was born when Sora stabbed himself with
the Dark Key. As for Roxas, Ansem never indicates where his composition
came from but he states that Roxas is Sora's Nobody.

I personally don't think vessels can split. It would be like taking an axe
and chopping someone right at the waist. For every one lost vessel
there is only one Nobody.

 

[Colours]

On the Destiny Islands Kairi disappeared and went threw Sora i guess that was when Namine was created then when Sora freed Kairi's heart some reaction must have happened and sora had two nobodies and that's also why Xion can wield the keyblade because sora and kairi have there own nobody so that's what i think.:closedeyes:

Please reframe from double posting, and Kairi didn't go threw Sora, they connected with
one anothers heart.