2021 NFL Draft Comps: San Jose State WR Tre Walker's poor athletic testing draws comparisons to undrafted prospects | NFL Draft | PFF

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2021 NFL Draft Comps: San Jose State WR Tre Walker's poor athletic testing draws comparisons to undrafted prospects

San Jose, California, USA; San Jose State Spartans wide receiver Tre Walker (10) signals during the second quarter against the New Mexico Lobos at CEFCU Stadium. Mandatory Credit: Stan Szeto-USA TODAY Sports

Comparing current NFL draft prospects to those of years past is standard procedure in draft evaluation, though most comparisons are built on the memory recall and subjective opinion of the particular evaluator.

This is part of a series of articles comparing the 2021 draft prospects to prior years and picking out the most similar comps with a clearly delineated and quantifiable method. This series specifically looks at running backs and wide receivers ranked in our top 200 prospects.

PFF data scientist Eric Eager has done tremendous work building college-to-pro projections, which are built off the robust college data we’ve collected since 2014 and have been applied to exercises like building an “Analytics” Mock. In this analysis, I’m going to use some of our advanced stats for comparison but primarily rely on traditional stats to go back further to compare the 2021 prospects to draft classes going back to 2006.

Without the NFL Scouting Combine this season, the important measurables like weight and 40-yard dash will be reported through the various pro days that will be taking place over the next few weeks.

METHODOLOGY

The comps below were derived from a two-step process. First, I converted all the most statistically relevant stats and measurables to percentiles based on the thousands of prospects who have entered the NFL since 2006 at each position. I then filtered the total universe of past prospects by those who had draft positions, height, weight and 40 times within a 10th percentile in either direction of Tre Walker. For undrafted players, I assigned a numerical draft position of 300.

The rest of the matching features were transformed by principal component analysis (PCA). I found the closest statistically comparable players by the euclidean distance between the players' principal components, listed in the top 10 below.

The metrics for PCA are: career market shares for receiving yards and receiving touchdowns, best-season market shares for receiving yards and touchdowns, yards per route run, and yards per reception.

For Walker’s draft position, I’m using an estimate based on the mock data collected at GrindingTheMocks.com. For weight and 40 time, I’m using the numbers from Walker’s pro day, with a 0.03-second penalty added to the 40 time to reflect the uncertainty of pro-day timed measurements.

Most comparable players

Walker had arguably one of the worst possible athletic performances at his pro day. At only 180 pounds (7th percentile), he was timed at 4.59 seconds in the 40-yard dash (16th percentile), posted a three-cone time of 7.75 seconds (0 percentile) and a vertical of 28 inches (0 percentile). Athleticism is less important for wide receivers when accounting for draft position, but a performance like this could keep Walker from being drafted.

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