I'm new to this site, and this investigation, but is it possible that he was standing on the top railing for some reason? Maybe he thought he might swing on the chandelier, climbed up onto the railing, and jumped off towards it, thinking he could grab it? If he was trying to grab for the chandelier, that might explain why he didn't instinctively cover his face with his hands? If he did succeed in grabbing it, or even if he just hit it, that might explained how it fell. If he "face-planted" into the floor, then the chandelier fell after him and hit his back, that might explain the marks on his back. It might have initially hit him in the back and then come to rest off to the side rather than directly on top of him.
Even if he didn't jump off the rail on purpose, if he was standing on it for some reason and lost his footing, he might have grabbed for the chandelier to try to catch himself.
I know chandeliers are supposed to be attached rather securely, but this one clearly was not. Unless someone climbed up and unscrewed it from the ceiling, it fell. I don't think that's disputed. Unless there is an indication that someone did unscrew it?
I haven't heard anything about the chandelier except that it fell down somehow, and that XZ, RZ's sister, cleaned it up. Apparently, she was injured and required stitches as well, but was flown out to another state before getting her stitches out.
His injuries don't make sense to many of us because we can't see how he could reach the chandelier, even if he stood on the railing and reached across. We also can't figure out where all the marks on his body came from. I've posted an article pages back that states that children who fall down the stairs typically don't have injuries on their trunk. Max had marks all over himself, including his neck.
Welcome to the forum.