K Solo undoubtedly stole it from X, and the fact that he switched the whole argument once X blew up is what makes it clear as day.
Solo was on Yo MTV Raps claiming to be the originator of the Spellbound style. And when they was like "we heard some cat that was locked up is claiming he came up with the Spellbound style" Solo continued to claim that he came up with that style.
Then once X blew up, his whole stance changed. Then it was "X never wrote any of the lyrics to my song Spellbound, that song was all me" even though that clearly was never the point of contention to begin with