I think our discussions on the 3185/6 are futile without Rolex disclosing their production reasons. While not trying to sound negative, I'm not quite sure about Billy's motive in writing those 2 posts (I did read it like 2 weeks ago). It's plausible but I would give more credence if it were posted by other trusted TRF experts.
P.S. I did get the new GMT2c booklet for my M series pepsi.