I really like the idea of Tiered or ranked Primals. I'm not so sure about Hydaelyn and Zodiark being primals, unless by ranking them as 0 you mean to say that they are the source of the other primals manifesting (ie. the other primals would not be possible without Hydaelyn and Zodiark). Is there truly a way to kill a primals then? We know that they can be sealed away, but can they actually be killed permanently?
Also, this makes me wonder also about the opening cinematic from 1.0. When the Agrias crashed into Silvertear Lake, we see a whole lot of primals being released. The ones they show us that we can recognize are Ifrit and Titan, but what about all those other streaks of light. Were all the Tier 2 primals locked away in Silvertear? We know where Odin and Bahamut were sealed and broke out from, so where did all those others come from? And where did they go for that matter?
I'm interested in what you all think the other primals released from Silvertear are.