The only real downside that I see with this is at wrist level; if he falls on the ground and needs to use his hands to avoid hitting the ground full frontal, like "emergency pushup" position https://pic8.co/sh/R0vSil.jpeg second pic stating from the top, his mechanical hand might very well end up damaging the wrist. I'm not certain of that, it can pass thx to an inch but it can also be an inch too much