Just a random side thought, but do you think the Paragon's Crown could tie in in any way? It probably just refers to the definition of paragon in that you need all DoW/M 50 to get it... but it's SE, so I'd like to examine every piece of info we have. :P

Also to throw in my 2 cents, I'm pretty sure that Urianger wouldn't be considered both an Archon and a Paragon unless he pulls a Severus Snape and works for both sides.. (spoilers). Summoning primals seems to fly in the face of everything the Archons stand for, so unless he really turned to the dark side I doubt it was him. He wasn't around for the summoning of the twelve though, so we can't really rule anything out... He seems to walk the fine line of rambling prophecy that lies between good and evil.