A second gear isn't just about house calls. It's also about the ability to turn the corner on the perimeter, and to get chunk runs by accelerating into the second level and running away from potential tacklers trying to fill the hole. Kyren Williams doesn't have the long speed of Tyree or GAIII or Adams... but if you look at his TD run against Clemson last year there is a 0.0% chance that Diggs makes that run. I'm not saying Diggs is bad, I think he does a lot of good things and has great natural feel for the position, but he's closer to a Cam McDaniel or Darius Walker to me. I might be wrong, but I see his upside as being a better version of Tony Jones. But he's just a freshman so who knows.