Why Can Xehanort Time Travel?
Why Can Xehanort Time Travel? Terra-Xehanort, Ansem, Seeker of Darkness, and Xemnas have the ability to move through time, because Xehanort became just a heart somewhere along his timeline (when he became a Heartless/the Robed Figure). They aren’t actually able to do so though without assistance from someone who actually has a time travel power.