>>8342916 They made a removable helmet that was too small for the head they were putting it on but shoved it on there anyways which stretched out the back of the helmet. So as I said before, it's warped.If they had not made it removable (or made it the correct size) it could have looked even better than the TVC, which looks like a miniature replica of the costume helmet because Hasbro 3D scanned the official film costume.
The Rogue One helmets do not suffer the problems of the OT helmets due to better manufacturing. They are symmetrical.