My amateurish guess is that the way to envision prospects and their future values is more along the shape of a triangle such that the upper prospects are few and far between and as you descend from one tier to the next, the population of similarly skilled players expands. So, just for grins, the top 3-5 prospects are a tier, then you've got another dozen that are about the same, then another 25 that make up the next group, and on and on. But a lot of folks like to get focused on cardinal ordering rather than relative grouping.