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Davidianian wrote:

I haven't heard of that! what is the reference?
Also the reason is because Bloodraven has no idea what Bran is talking about when he asks him, and thinks Bran is asking if he was a member of the Night's watch. To me seems obvious he's not that entity, just being used by it.

The "Omni-Walder" is the grand theory that all Walders are a single time-travelling Walder.
This means that all of House Frey's political bickering amounts to nothing, as the eventual winner is always just another incarnation of the same person - Walder! This is GRRMartin showing the futility of feudalism, and how it amounts to nothing.

_{or something like this ... by the way, this is a joke theory}