I wonder is the story canonical (related) towards the original Saint Seiya series. It looks like it since they showed the Wailing Wall in Hades Arc... The question still remains is how does the 12 Gold Saints (Well 14 if you include Kanon and Shion) come back to life? And how did they came in contact with Athena's blood? Athena only came back during the final battle with Hades and by then the 12 Gold Saints are already dead.