Sporak, although you raise an interesting question about the 'wire', I don't think the 'Obituary' photo is clear enough to warrant drawing any conclusions. The wire is partly under the clamp and it's just possible that reflection patterns are causing it to seem not to be there. There may also have been paint on part of it at one point, which would make it vanish against the dark gear.
Again, it's an interesting question, but I'd call it an open one.
As for not seeing matching markings on the Chronicles and 'Obituary' saber--I do see them over by the transistors, but again, the whole issue is questionable because of the lack of resolution.
Whatever our assumptions about "film production", we don't have specific information on how Elstree/Lucas productions worked on this issue at that time, so IMO until or unless specific evidence arises that there was more than one 'hero', we should assume there was only one.