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Anyway you mean XH(Xehanort) not MX(Master Xehanort), 2 COMPLETELY different people.
you can tell theyre different at a glance man. anyway i have no idea who started it, i think i was one of the last to see the theory wich, by that time, was all over the internet. aIm one of those KH fans who have a firm belief that Terra is XH
It wasn't one person, but rather multiple people firmly believe in something due to the obvious logic in it. Terra and Xehanort are nearly recolorings of each other, and when you combine that with MX's presence; his clothing, name, and hair color, you get a whole community believing, in some variation, that MX combines with Terra somehow to give us the current Xehanort.