As far as Anakin’s body dematerializing, I like that we don’t see it happen because it leaves it open to interpretation. Perhaps it dematerialized a few seconds after the end of the shot, and you can believe that if you want to. However, there is the fact that Anakin doesn’t just have a cyber suit, it is that much of his body has become mechanical. Would all of his robotic limbs and implants just be rattling around in an empty suit like in the Left Behind series? Seems silly to me.