^^
Agree. I try to balance the stories with experience. I know human nature pretty well. People tend to exaggerate a bit. If you are being interviewed you tend to spin your involvement to best advantage. You are selling your wares after all. That's fine. It does tend to confuse when we try to figure out the timeline of events.
George is the creator and director and gets the blame for bad so he should get the praise for good. Of course he didn't do it alone. And as you say, Marcia as well as his director buddies, Coppla, DePama, Spielberg etc, gave notes to help make SW what we love. But ultimately it is Georges decisions, yes or no, for what goes in to the film. People present things and are accepted or rejected by George. The crew is there to try and facilitate the directors vision. Good or bad. He is responsible so he gets the credit. People are usually not speaking philosophically when being interviewed and may "forget" to mention others or it is edited out for time considerations. I tend to let it go unless there is a huge conceded ego that is purposely diminishing the cast or crews importance.
I try to take everything I hear with a handful of salt. ; )
There was a group effort. Everyone played their part. Who did what exactly can only be answered with detailed questions and so far no interview was ever done that focused on the blaster history specifically.
Bapty had Mausers. Roger and Carl fabricated the preproduction HERO at Bapty together it seems. Maybe Carl showing parts to Roger and trying different things.
IMO based on all I've heard to date:
Roger and Carl end up with basically the Sweeney gun with left side scope and a MG81 FH attached.
The initial idea was accepted by George. Roger has the art dept. make a mold and cast the MerrSonns.
Maybe after testing they find the left side mount and scope too big and clumsy and can't be used cowboy style so Roger takes it back to Carl. They find the ST scope and mount. He has Carl switch the mount to the right side and fit the scope.
They take the pre-production photo.
Roger has the Art Dept. mold the right side mount gun now. This becomes the Luke stunt with no grill.
Roger/crew adds the plastic bits to complete the HERO. Grill, Sight, Mystery disk etc.
Roger said and we have some confirmation that there was only one HERO holster made for ANH and does not mention a backup blaster. He does say they made a blaster for Luke BUT it was a different design... that became the ESB.
Could this second "Luke" blaster Roger mentions be the Bapty website blaster? Hmmm...