no that would be impossible because soras memories created xion (her hole body looks and all) and for her to give them back, she would have to not exist.... ((Think of it this way. xion was a living imaginary friend that only sora could think of an create. she sense he created her, shes apart of him. in mind an body. so, in order for him to regain his memories back from her, he would need to take her hole being back to him. there for she does not exist... )) namine needed to put the memories some where so yea