Having fresh eye on a hunt is always welcome
well there are some folks who are in what i am calling camp 3 "Those who believe the part was machined (created from stock)" who feel that way.
Camp 1, people who believe this dental piece was an unaltered known part, easy to place / install on the helmet. what was easiest to do for the builders
Camp 2, people who believe more likely that the builders altered a known part, nothing to complicated vise down, drill one hole - done.
Camp 3, Those who believe the part was machined (created from stock). too hard time consuming, imo