I'm just going to throw my .02 in... I like the idea of the TTB setting a craft distillery standard, and in my opinion there isn't a need for a separate "craft blended" category. If you have a DSP and fall under a certain output, you should be able to label your product as "Craft", whether you're 100% from scratch or just part of it. If the big boys want to buy out a small distillery and operate that distillery under a separate license that complies with the rest of the standard, that is just the price we have to pay. Excessive regulation isn't good for anyone's business.
Regarding the title of "Master Distiller", I think some are getting on their soapbox a little too much. If I have a DSP and a commercial product that I am distilling, I am the Master Distiller of that product. No one else is in charge of it, right? The label of "Master" tradesman is a tool of unions and trade associations to maintain control of an industry. Until we feel a need to unionize or major universities start offering Master's degrees in Distillery Science, we are arguing over a standard that doesn't exist