Roxas might be coming back.
Ansem (about Sora): ’He has the power to bring back the hearts and existances of those connnected to him- to recreate people we thought were lost to us forever. Our most precious treasures- even an empty puppet (Xion?)- the trees of the forest, and the petals on the wind. There are hearts around us everywhere we look.’
I know Roxas is a part of Sora, and that this reference is mostly about Aqua and Ven, but since he mentions ‘an empty puppet’, and mentions earlier that all nobodies have hearts of their own, I think he mentioned Xion for a reason. Xion and Roxas. Back. With Axel (/Lea). Again.