I just listened to the interview (which is awesome, btw), and found Brandon's comments about there being more than just 16 alloys for Atium and Lerasium to be VERY intriguing. So what are your thoughts?
I think that you have Atium, Atium alloyed with Lerasium, Atium alloyed with each of the sixteen metals, then Atium alloyed with Lerasium alloyed with the sixteen metals (and that's just the Atium side of things!).