I'm sorry, but I'm going to have to respectfully disagree about Jalin's speed.
I'd like to base my counter-argument on the Jalin Marshall that I've seen dominate SW Ohio D1 football, the D1 track star, the speedy slot reciever/H-back from the '14 national champs, and the guy who's name was called to race Braxton and Zeke during halftime of the spring game, but Urban yanked since he played the whole first half.
However, I don't claim to know more than you or be an expert on 'game changing' speed. Instead, I'll defer to Urban Meyer, who fits both of those qualifications, and has repeatedly said that Jalin is a candidate and "almost there" for Ohio State's deep threat at receiver. Unless Urban doesn't know speed, and he does, then I think that speaks for itself.
He needs to fix the ball control, but he and the coaches will figure that one out just fine.