He didn't participate in the combine ... but this has to mean something: Van Jefferson was the fastest human at the Senior Bowl [www.turfshowtimes.com]

The article suggests that Jefferson might have run in the low 4.4's with this analysis:
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This was backed up by Jefferson’s speed on the field, which was clocked by Zebra Technologies as the fastest of any player at the Senior Bowl: 21.05 MPH. Zebra Technologies clocked 2019 rookie sensation Deebo Samuel at 20.97 MPH the year before. They had McLaurin at 22.15 MPH.

Samuel ran a 4.48 at the combine at 215 pounds. Jefferson is 6’1, 200 pounds. Could he have run in the low-4.4s? McLaurin, at 209 pounds, ran a 4.35.

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