Kingdom Hearts II Sora not coming back but how

Ok i have no clue how he is not coming back because at the end of all the credits in kh2 he gets a letter from kingmickey but he dosen't read it i think that he comes back as a party member like one of the worlds the chasers go to is destiny island and your party member is sora.

what do you think?

 

i dont like it i would want to be sora hes the best he cant be a sub charter :( but when he read the note he smiled at the end so it must be good ....well for him :(

 

I hope he comes back.