Anhylde was the leader of the nine though, it is quite possible it just depends on their individual Powerlvl.Mehrunes remembered it right. Annhylde alone died to ress Sylvanas the first time. Which makes quite curious the necessity of 3 of them for the second ress.
Included the one killed in Andhoral, Sylvanas should have 4 Val'kyrs left. But given how the number of sacrificed Val'kyrs increased with each ress, they could not be enough to resurrect Sylvanas a third time.
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