REGISTER TO REMOVE ADS
Not... really?he's reformed with xemnas as MX, as well as his ASoD self being out of time as seen in DDD.
If that's what happened, then the "most future" version of Xehanort would have reformed looking like Terra. Instead, it seems like his heart rejoined with the original body that he ditched at the end of BBS.
Xemnas might've technically been Xehanort's Nobody, but the body is still Terra's. Looks to me like it went somewhere else, rather than re-forming with Xehanort's heart in it.