If any thing your comps galvanize my theorie , the ESB hero screw is to high to go in to the wedge part,an we cant see were they are on the ROTJ ,
An the Banazi helmet isnt actuallly fan made, far from it, and the red lines you marked on it for the ear tend to slid to far back on the lower half of the ear,
Blow up the hielman pics,you can even see in the slot that the to suspect holes are bronze not silver, and there is any pics clear enough to show themthey are there ,
And mabey some better refrences, may come up soon,,