This is not quite true, if by describing a blend as "uncased," we are referring to a blend that has not had any sweetener or other flavor augmenting casing applied. Technically preservative additives, which are applied in the same way, are casings as well, but these do not contain anything that contributes a detectable flavor to the tobacco, and therefore these types of preservative casings are, I think, not what most people are referring to when they talk about blends that are "cased" or "uncased". So if we can agree that, for the purposes of this discussion, casing refers to added sweetening agents or other additives intended to change the taste of a tobacco, then C&D makes a very large number of blends that contain no casing or toppings.
Most manufacturers, C&D included, will purchase a particular lot of tobacco that has been harvested, cured and either hand-stripped, machine stripped, or in whole intact leaf, and then those manufacturers apply casing to the leaf themselves, or have the processor that they purchased the leaf from case it for them at an additional cost. All of the tobaccos that we purchase come to us untopped, uncased, except for Black Cavendish, which is cased as part of it's process. None of our other tobaccos are cased before we receive them into our facility. In instances that we do use a casing, that casing is blend specific; Sometimes applied to the entire blend, sometimes applied to only one component in the blend prior to blending. We have only a handful of blends that are cased, many that are uncased and untopped and a few that are topped but not cased. For example Opening Night and Union Square are examples of truly untopped, uncased Red and Bright Virginia flake. Derringer, on the other hand, uses the same Red and Bright Virginia but a brown sugar casing is applied to the blend prior to pressing, yielding a different, but still very natural flavor profile, compared to Opening Night or Union Square. In every instance where casing is used in our process, the casing is designed specifically for one blend, and is not used on any other blend. I know of no other manufacturer that takes this approach with the level of granularity that C&D does.