Well, there isn't anything really to grade. That is a well dug and properly cleaned (not too clean) collection there. They are mature, large in size, are not damaged and are more chunky than not, and have good dark skin color. I'd pay top dollar for those as a collection.
If I were to comment on each root, this is my opinion, starting at the top and going left to right.
1) The neck looks a little fat and short, but a large root with good color and nice wild character.
2) Again notice how fat the neck is. This root appears to have been transplanted or in an area where the shade was altered. Notice how the roots start to grow quickly -long and thin after the nice chunky sections with good wild character.
3) Good wild character and mature, but not as chunky as the others. The least desirable one of the bunch, but still very nice root.
4) This is an ideal root. I'd pay a bonus over market for a bucket of these
Chunky, big, dark skin and nice wild character with a long neck too.
5) Again, this looks like a transplanted root. Notice the wild character of the chunky portion at the end, and the thin, old neck. Then, as the feeder roots start growing, notice how thick and fat the neck becomes. Also notice the difference in color between the older section of the root and the newer feeder roots.
If I were to rank these in order of desirability, I would start with 4 as this is the goal. Nothing wrong with this root at all. This is what we want. I would rank them 4, 1, 2, 5, 3. A bucket of roots like 4 will bring a bonus, and a bucket of roots like 3 would be just under going market.
Again, all of them are nice and I'd pay top dollar for that collection. Most importantly, you handled them very well and did a very good job.