Yes, I'm getting something just a little faster in this video too. But I would still call it at or around 3.8. Speed is indeed an important tool as it helps a lot with production in that he will tend to get on base more often with those safe call. And guys that are fast can get more extra bases and steal bases to get into scoring position. It's a big plus if he can add this + tool to some other average or even below average tools. Someone with that kind of speed can be a + in the outfield if he learns how to play out there and track down fly balls properly. So, the coach moving in to the outfield sounds like it is a good decision.
Good luck to him. I hope that like my son's freshman year, he's bringing a big smile to the game and really enjoying himself.