Somebody actually called Tyus slow footed...
Some quotes from various scouting resources:
"He's not an exceptional athlete on top of that,
possessing just average speed in the open floor,
without a great first step or vertical leap to compensate."
"
Lacks ideal quickness and athleticism most top flight PG prospects possess ...
Doesn't possess a great first step. Struggles to beat quick opponents off the dribble"
"Even more of a concern for scouts is Jones' struggles on the other end of the floor. He was not a very good defender at the college level, even if he was able to improve as the season moved on.
He has average lateral quickness, and his lack of strength does him no favors when trying to get over the top of screens."
"While most praise Jones’ intelligence, game management, and ability to show up in big moments, it’s clear his size and
athleticism are limited. He isn’t quick enough to consistently drive in the paint or to keep a defender in front of him. At the professional level, an offense won’t succeed without at least a moderate athlete at the point guard position, and that’s the rub against Jones. It isn’t clear, right now, that he can be anything more than a moderate athlete when going up against NBA players."
"Does not have elite speed or athleticism."
"With so many of today’s top point guards being physical specimens, Jones
doesn’t have the size,
speed, and leaping ability of many of the NBA’s best.
This also hurts him defensively as it is unclear whether he will be able to keep the likes of John Wall, Russell Westbrook, and Stephen Curry in front of him on a regular basis."
Guess I'm just making it up. Like I've been saying, guy is a terrific offensive prospect because of how he was coached and how he doesn't turn the ball over. But unless he finds some new found athleticism, he is going to be a train wreck on defense.