No, you're wrong.

ff5/ff6In ff5, the two worlds were seperated and X-Death brought them back together. The two world's geography never changed, they were just merged with eachother. The cities were still in the same location as they were in their respective, split apart worlds. Now, if you count the N-Zone sucking up cities as Geography changing, you'd have more of an arguement, but in a way, he didn't. He put them in a different dimension, and the way to the N-Zone was left.

In FF6, Kefka changed the locations of many cities, re-arranged entire land masses, created a few new areas, and what-not. What X-Death did doesn't compare to what Kefka did.

There you are XD