My understanding is a number of barrels of Louisville-made and Versailles-made whiskey are mingled for a particular bottling and this batch gets a number. All the whiskey is aged in Versailles. In each batch, there are varying amounts of the whiskey from the Versailles stills (pot stills), anything from only 25% to half or more. The idea is not to work to fixed proportions but to get rather a certain taste profile. This is a quality whiskey any way you look at it, which is not to say that each batch tastes exactly the same, in my view there is some variance but this is to be expected with bourbon (any bourbon which is partly a natural product and can't be standardised 100%) and a WR offers a particular craft approach. Anyway this is my take on it.