Pitcher velocities pre- and post- draft can and often do swing all the time, and that’s more easily defined than speed When considering speed in a baseball context, it's exactly as identifable as pitching velocity. One uses a radar gun, the other a stopwatch. Or Statcast for both. Just because one is defined more often does not mean that another is less identifable. But you're smarter than to make this argument. You know that pitching velocity can be altered by about a million mechanical things, as well as arm health and such. The same does not apply to speed. Name one 21 year old who not only got slower, but TWO levels slower, in 4 months without sustaining injury or gaining a ton of weight? It just doesn't happen. That's why I think toonster's mention is probably spot on. Law surely wasn't talking about speed, but the all-encompassing "baserunning". There have been plenty of players that had insticts and IQ off the charts in other aspects of the game, but weren't good baserunners.