I found one place that says he runs a 4.42, but take that with a grain of salt. When guys run 40's at the NFL Combine, it doesn't always match up with 40 times that are reported prior to the combine.
He has plenty of speed. I've always thought he was our best all around pure runner, but he wasn't the best all around running back at that time. If he's able to put it all together & not be a liability in certain aspects of the game, he can do some exciting things with the ball in his hands.
I'm not gonna lie, I've personally been rooting for Tre Bryant. He has that break away/game breaking speed. But if you'd asked me for a prediction prior to spring ball who will be our starter in the fall, I would have said Ozigbo. I'm not sure what's going on with him at the moment.