This was from the horses mouth awhile back. He hasn't posted here in awhile, but here was his response on the 10SPL.
PGStaff posted:
We feel it is a very important measurement.
If 2 tenths equals a full stride and you had one shortstop run a 1.5 ten yards and another run a 1.7, which one would have more range? Actually to some degree that would hold true for every position. It would also tell you who the legitimate base stealers are.
There might be a hundred or more sprinters that can beat Usain Bolt in the first 10 yards, but no one can beat him in 100 meters. Baseball players can be the same way. We have seen splits that are very revealing, such as 1.75/6.6 and 1.5/7.1. It could be argued that, in many ways, the latter has more of an advantage in baseball, despite being a half second slower in 60 yards. It is the reason the best base stealers aren't always the guys with the best 60 yd times.
However, there are times when late speed is actually more important. When scoring from 1B on a double. Ideally you want the distance from 3B to HP to be the fastest distance covered. It allows the 3B coach to make better decisions and it is where you either make it or you don't. So in cases like that you could argue that later speed, or maintaining speed is more important.
Humans are like race horses or Greyhounds. Some are faster at the beginning, some are faster at the end. It is our belief that being faster at the beginning is more important in baseball. And for the few that are fastest at both the beginning and at the end, they are extra special!