Love the rigor, and list of historical breakouts. Stopped reading after you included Lev Bell in the average, and used standard deviation to determine marks. You claim round 9 is the average, but once you rule out outliers, the truth is more around round 4. Median would be far more useful for this dataset, and that's around 3 (eyeball).

Standard deviation doesnt make sense in a draft setting for a number of reasons - primarily that the sample isnt large enough to achieve a reasonably normal distribution (assuming normal theorem applies), and drafts don't aggregate to a bell curve (normal theorem doesnt apply). RBs are selected strategically based on positional advantage. Using a bell curve would only be applicable if drafts were all-flex. So even at massive aggregates, you'll see bumps in the first 2 rounds, dips in 3-4, and another bump around 5-7, followed by valley afterward.