Dan James has a high top speed, but not "fastest in the league". He does however have tremendous acceleration, and is very fast with ball in his feet. Essentially: Once he's past the defender he's not catching up, which is his strength.
He IS fast, you can't deny that.
I'm really annoyed because there is a player there, we saw the first third of the 19/20 campaign.. but yeah, he's not contributing hte way he should be doing ever since then, nearly a full season after. His end product is not good enough. He's still young enough to develop it but I'm not hyped right now