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For some reason, I really like the idea that Whitley is unique in that he has no aura. Like nothing at all, no semblance, no glowy shield, no enhancement coming from the soul. Nothing.
I also really like the idea that he has Elsa powers. This is probably just me though.
Edit: Ny head canon/ ideas is that Willow tries to unlock Whitley’s aura but can’t. After a few test with some huntsmen, Jacques finds out about the tests and Whitley’s lack of aura. He then covers it up by destroying all records of the testing, and the huntsmen go on their way. The huntsmen are genuinely killed by Grimm so the only people who would know are Whitley, Willow, and Jacques.