not all Bw horizons are cambic?

The textural criterion for a cambic horizon, as specified in Soil Taxonomy, must be very fine sand, loamy very fine sand, or
finer. However, in looking at some Official Series Descriptions, including those for Carver and Runclint (both Quartzipsamments),
I noticed that the typical profile for both series includes Bw horizons, which I assumed would be restricted to Inceptisols. These
Bw horizons have textures of fine sand and/or sand, which I thought would exclude them from being Bw/cambic. My ""amateur
pedologist"" question: is it then true that all cambic horizons are Bw horizons, but NOT all Bw horizons are cambic horizons? I
also thought that, given a texture coarser than vfs or lvfs, the only option (in the eastern US at least) would be to classify a B
horizon with minimal clay content as a Bs horizon, assuming that some translocation of sesquioxides had occurred. If the two
series mentioned above are Quartzipsamments, why does the description include a Bw horizon rather than simply a C horizon?