1) KSU's pro day was yesterday.
2) I do recall Snyder having the players tested shortly before spring drills to measure progress. In fact, I think he mentioned something about it either last year or the previous spring at his presser prior start of spring practice.
3) For pro days, scouts literally measure the 40 yards with a tape. There are the "38 yards" stories of yesterlore that force them to be precise.
4) you can see the electronic timing devices on the pro day videos. hand timers can be off...electronic timers are death, taxes, and who wins the big 12 basketball title.
But I do agree...these times seem a little quick.