Pretty sure you mean 8610-1 (which is the one you use for the RC application). But yes - you're correct - if you're getting the RC for a particular plane, that would be the one you'd have to list on that form as the "Record of Experience". And then there would certainly be a discontinuity if you weren't listed on the 8130-12 (but again, they'd have to cross-check).
So it seems as though, to make things right with no chance of paperwork issues, there have to be three forms that all agree - the 8130-12 (list all builders), the 8130-6 (who says it's ready for an AC) and the 8610-1 (the actual application for the RC). Although I suppose, if there are multiple builders, one could argue that the EAA's position isn't totally accurate since builder "A" could say it's ready for an AC while builder "B" gets the RC.
Angels dancing on the head of a pin, at this point...
Agreed.
Which just goes to show you that the FSDO's are all different, and change over time. I don't think that I was even asked any questions about the plane when my RC was issued - maybe a couple of minor ones, but nothing resembling a "grilling". They figured if I built it (which I had well documented) that I knew something about it. But obviously, YMMV, as every FSDO has their own interpretation of the rules.