Seeing people discussing prospects of this class w/ their speeds they expect to hear at pro days. Let's explore this short thread & share @MyFantasyLeague

Note: if hearing a pro day is not using laser time on 40s, expect to add roughly 0.05 seconds to time for human delay.
Start with 2021 prospects with those that have times from their High School days:
R. Moore- 4.33
K. Toney- 4.69
J. Chase- 4.66
J. Waddle- 4.52
T. Wallace- 4.52
A. St. Brown- 4.67
T. Marshall- 4.53
A. Rodgers- 4.49
S. Williams- 4.53
A. Schwartz-4.34

Alright stick w/ me on this
Now compare some of past classes w/ known 40 times in HS & Combine:
2020(not all)
name/ HS 40/ combine 40
Claypool/ 4.6/ 4.42
Davis/ 4.68/ 4.54
J Jefferson/ 4.88/ 4.43
Jeudy/ 4.55/4.45
Lamb/ 4.6/ 4.5
Shenault/ 4.59/ 4.58
Reagor/ 4.41/ 4.47
Duvernay/ 4.38/ 4.39
Hodgins/ 4.76/ 4.61
Outside of Jefferson and Swain who improved (4.75/ 4.49)never taught proper 40 form in HS, most guys did not make significant improvement of more than 0.15 seconds. This is after guys spent time of three-four years in a college conditioning program.
2019
name/ HS 40/ Combine 40
Boykin/ 4.51/ 4.42
Isabella/ 4.39/ 4.31
R. Ridley/ 4.83/ 4.58
Slayton/ 4.92/ 4.39
Campbell/ 4.41/ 4.31
Hardman/ 4.48/ 4.33
McLaurin/ 4.41/ 4.35
DK/ 4.72/ 4.33

Similar trend of only Slayton, Ridley, DK seeing big changes. Most everyone was about same.
Past Classes:
Chark/ 4.46/ 4.34
Kirk/ 4.49/ 4.47
Gallup/ 4.55/ 4.51
DJ Moore/ 4.31/ 4.42
Ridley/ 4.65/ 4.43
Godwin/ 4.48/ 4.42
C Samuel/ 4.36/ 4.31
Juju/ 4.71/ 4.54
Agholor/ 4.59/ 4.42
Diggs/ 4.45/ 4.46
OBJ/ 4.5/ 4.38
Again I could not get a large sample from some older classes when using ESPN's info, but this gives a good framework. We see it is possible to really improve with DK, Slayton, Ridley, Swain, and Jefferson. But most of these guys showed smaller improvements if any.
And this is with many coming from big programs able to fund their training in conditioning programs in college. So be careful with assuming all of your favorite receivers to be sudden burners if they were not showing that trait in high school. Most will be similar or small gains.
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