Thir and the 16th Sovereign

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I've recently been looking up both Thir and the Sovereigns in order to best formulate a plan that my character has, and when I was looking through my books I noticed a discrepency of sorts.

Dragons of Eberron under religion states that "the common doctrine holds there can only be fifteen ascended Sovereign spirits at one time..."

The Eberron Campaign Setting states under the Religion DC 25 note that 16 dragons ascended to become Sovereigns during the Age of Demons.

So does this mean that the 16th Sovereign's identity is lost to the dragons for the most part as well? At this point I don't think it is important to my character's plan, but I'm curious about it after noticing this bit of lore.