If your question was about him not self teaching himself because you think he created it, you are wrong. He didn't create footwork, that's from boxing. He just brought that over to his mma game. It's boxing footwork, he didn't invent anything. He just added it to his style. It's self teaching because he self taught himself boxing footwork. You are thinking he created footwork lol. If you are the one that keeps thinking he invented something, it's just boxing footwork with stance switching. But he's not a real switch hitter, he doesn't heavy combinations from either sides, he just has singular attacks or left and right punches and some leg kicks he can throw from both stances. But he isn't staying primarily in opposite stances and working both offense and defense. He only does it with his movements and resets. He'll jump in with his rear right or left punch while switching stances to catch people while they are trying to time him or chase him down and circle out or back up and reset. That's Cruz's game in a nutshell. You didn't want a detailed analysis of his style but there it is anyway. It's not hard to solve, it's not some kind of difficult puzzle. People just don't understand the necessary steps in order to understand it.
I just gave you a free lesson. You can pretend you don't care or you didn't want that info. But you are the one on here trying to get the info lol.
Also with that info it doesn't matter anyway, because Cruz has better footwork/movement/timing than most of the people he will fight. So most will get stuck watching him because they can't figure out his style. Even if they know what he's doing it's different when he's in front of you. Still need the footwork/movement/timing to keep up.