What if Ben turned into this titan and then someone went behind his neck (the location of the human body that controls the titan), what would we find? If we found Ben that means that he did not just transform, he was placed inside another titan body and thats not how ben transform and when you turn into one of the 9 Titans, it's like putting it in a robot that you control, not like Ben does. So even and I repeat, even if titans had a different DNA and a ben turned into them, he wouldn't be able to control them