The MythMaker writes...

A long time ago, you asked if anyone knew the origin of the "eye in the pyramid" symbol for the Illuminati/Masons/etc. Since I saw no update on it, I thought I would give you the short version (the long version would take several pages).
The pyramid represents knowledge, taken directly from ancient Egyptian mythology (before the whole "Pharoah's Tomb" fiction was created) but the pyramid in the symbol is truncated, representing lost/suppressed knowledge. The eye is the "All-Seeing Eye" (God) and placed in a triangle above the truncated pyramid to point out that no amount of official supression will destroy the knowledge forever, it's still out there to be rediscovered.
The second layer of interpretation is part of where the Illuminati as "bad guys" comes from: they were "enemies" of the authorities throughout history (some rare exceptions) because they had managed to retain the missing/forgotten knowledge, and the authorities (who were seen to not be wise/good enough to be given access to the knowledge/power) were jealous and either wanted the knowledge for themselves or wanted these "outlaw" groups killed, or preferably both. The official church declared them to be Satan-worshippers; these groups considered themselves to be the true believers of God and the church to be full of Satan-worshippers (or at least selfish opportunists). So, the symbol shows that they believed in God (in spite of what the authorities claimed) but also shows their own recognition that they would always be in danger from outsiders who would try to supress the "truth".

Your "grey-area" approach to Duval and the Illuminati is a great way of showing that, in spite of what we are often taught, black and white are ALSO in the eye of the beholder...