I am not trained in anyway to grade leaves. I am not even sure what is meant by that either. I do know that leaves picked from the bottom have less flavor, but smokes very mellow, without much nicotine. Leaves from midway and up, were the leaves that formed latter, when the plant was flowering , thus it has more flavor and nicotine. I sorted my leaves based on color and aroma. Any "off" smelling leaves got culled. This year I culled a lot more than most years, because I had some mold forming on a couple of stacks. I wanted to get them sorted and processed, to prevent any more of that. Usually, I would have waited a few years. Processing early will be my experiment. The only thing I worry about in processing early is maybe gettng some harshness from not allowing the ammonia to "gas off" of the leaf.
I have only processed the fermented leaf. The yellow will still set for a couple of years... unless I see mold. I am just guessing that the fermentation process, more moisture than usual, and the storage bin was kept a little more warm than usual, was what started the whole mold process.
I may use a light misting of the diluted calcium propionate next year, after I stop the fermentation. Regardless. I am more than satisfied with the flavors I have now in this batch of reds.