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You would expect that 1183-185 would be 998. So there must be certain elements that somehow are NOT getting counted as ITIL users? So they're not in the original set? So they don't get subtracted? That's the only answer that makes any sense to me. This suggests there is a bug in the ITIL users count. I may need to compare the ITIL users account I get from Allen's method with the one I got from my old way that takes longer.
I compared my long ITIL method against the Alan method and still came up with 1183; so I'm baffled. Anyway, this is a sufficient answer. Going to wrap it, and hand it over.