Another factor not discussed here yet is the field condition. Players are able to run faster on artificial turf versus grass to begin with. And then if the ground is soft and/or wet, that also has the potential to impact everyone’s speed as well. So whatever top speed Henry got up to was likely subdued in some respect, versus if these guys were running on a more pristine surface.
That said, if one watches the replay, it does seem that Henry is faster than Hamlin and Lewis, even after those two guys have had the chance to get to their top speed. Benford was gaining on Henry, but got a late jump and had to go across the field.
Later in the game on Henry’s 38 yard run, Douglas also chased Henry down.
So, my conclusion is that Benford and Douglas are faster than Henry, but doesn’t seem to be the case with Hamlin and Lewis. Whether that means any of these guys are slow depends on what we think about Henry’s speed too, but it’s not like this is the first time he’s ever broken a long run.