With more speed on the field, guys like Parrish, Evans, and even Everett will hopefully be able to use that speed to gain more separation off the LOS against a defender. This should translate into JP being able to get the ball out of his hands faster.
The only concern I have is if Parrish will be able to be physical enough with a defender playing bump in run at the LOS. Teams will be jamming him at the LOS so I would expect to see a lot of motion out of Parrish and once he does learn to use his hands to shed a defender at the LOS, he will get separation and if they get him the ball, he will rip off some deadly YAC.