Ready Rubbed and ribbon cut are different things, hence the different nomenclature, though the difference can be subtle. Maybe a glimpse into the manufacturing will help clarify the terms.
To make ribbon cut, irrespective of how coarse or fine the ribbon, tobacco is lightly pressed into a "cheese," a block of tobacco that's fed through the cutter. As the block indexes through the cutting head, the blades shave off the correct thickness, and the ribbons fall onto the conveyor. Typical cuts range from 12 per inch to as many as 64, though most pipe tobaccos are in the 14-24 range. This is sometimes tumbled to further break up any strands that happen to stick together.
A ready rubbed starts out life as a plug. The tobaccos are put under considerable pressure for several days, resulting in a hard block. This block, when indexed through the cutter, yields slices, or cut plug, or flake—all different words meaning more or less the same thing. These slices are then tumbled until the result is more ribbon-like than a broken flake, but with a still coarser consistency than true ribbon. There will be some clumps that resemble several ribbons stuck together, but there should not be a large quantity of cut plug.
I hope this clarifies more than it obfuscates.
-glp