Again, its for dueling... those ounces go against speed and agility. Which in the case of a dueling knife are, along with reach and sharpness probably the most important features you are looking for. Edge retention and overall strength are clearly secondary.
Maybe I was not clear in my first point, Making a blade stronger by adding metal does not necessarily make it better, it can actually be VERY detrimental to the overall performance of the blade. Why? because extra weight can affect the overall balance of the blade, pack-ability, agility, reach, etc, etc. there is a point of negative marginal returns when you add more steel to a knife.
Another thing, have go considered that if CS decides to go with a full tang, that means they will either have to shorten the blade or make it out of a thinner stock if they want to keep it around the same weight? Also, by making it more handle heavy, the blade will feel (and probably become) slower?...
remember, before thinking about strength, first consider the intended purpose and then think about how strong the blade needs to be to perform without any issues.. not the other way around