They had a brand that was so powerful it was used as a verb, and he gave it up for the letter that is used as a generic placeholder, just because he's obssessed with it for whatever reason.
Saw a theory a few weeks ago that he's obsessed with "X," because that's how most of the native Africans signed away their sovereignty, and their land, to the European invaders.
No proof, but given where he grew up, it seems plausible.
