I'm also a former corral C runner. This year was my first in B and my experience was so much better! I hope with the expanded POT it will extend to C and not overcrowd A and B. When I was in C I felt I was appropriately seeded at that time, however, I felt like there were many, many runners who were not and it impacted my ability to run and my overall experience. I had to arrive early and line up before the corrals opened to hopefully get to the front of C. No time for pictures or socializing really. And even then I was blocked by walkers right out of the gate. There is just no reason C needs to hold over 50% of the field. It doesn't make sense so hopefully this will alleviate the chaos that is corral C by making it another smaller POT corral. I worked hard to get my POT to get me out of C so I'm really hoping B isn't the new C.
Also, my opinion, a lot of people dislike CrD getting B but I feel like there are way less CrD in B than there is misplaced runners in C. That corral is more problematic due to its size and the co-mingling of people intending to run a quicker pace and people from the back wanting/needing more time so they pick the first available non-POT time.
If rD had enough employees to check I think they should allow everyone to submit a POT from a valid race and seed every appropriately. Its benefit is two-fold: puts people in the appropriate corral as well as gets new runners experience in an official race (and supports local races!). Everyone is always complaining about lack of race etiquette and some of that is due to so many beginner runners at these races.