This might seem rather simple to understand but I'm not familiar with some of the terms in this portion of the class profile. I would be grateful if someone were able to explain the difference between the "candidate pool" and "qualified candidates" along with what caused the drastic number switch. My guess is the candidate pool came from the preliminary application and qualified candidates are 3Q'd with a nomination which is what caused the large shift in numbers. I have attached the portion of the profile to this post. 
