Jack Brickman
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You have to provide a reason why.
The reason has been provided a dozen times over in this thread. A site did research on years' worth of drafts where prospects ran at both the Combine and their pro day and found that the average difference was .05 seconds. And so they add that time to pro day times as a consequence of that research.
I think we can all agree that this system isn't completely perfect, but I'd argue it makes more sense than not adjusting the times at all when we know they're probably inaccurate to some degree. Not every time would be exactly .05 seconds faster. Some might be .03. Some might be .08. It is, again, an average.
What the CBS draft profiles have done is just allow a .05 variance for all NFL prospects this year. So, for example, they say Micheal Carter is between a 4.50 and 4.55.
I think this is the most responsible way to do it, because just adding .05 doesn't solve the human error.
And that's a fine system if you're just listing times. However, if you're running a database, you can't input 4.50 to 4.55 into the field for forty time. You need an actual number, not a range, and so it was decided to add the average variation between forty and pro day times to each prospect who opts to not run at the Combine (or there is no Combine like this year).