How Many "Genuine" Tobacco Manufacturer/Processors Are There?

[RSteve]

The threads about Mel Feldman's The Smoker, Watch City and The Country Squire and "hand blending" got me to thinking about where their tobacco is sourced. It seems like MacBaren/Sutliff is sourcing most of the processed tobacco for blending by U.S. blenders. Is C & D processing tobacco for their blends or are their tobacco blends assembled from another processor? As a very amateur home blender, during the past year I've seen most blending tobacco from Stokkebye disappear and virtually all my recent blends are made up of Sutliff tobacco.
Are the Country Squire and Watch City blends primarily Sutliff, with perique coming from Mark Ryan?