Idk. When I went and looked at the 2021 Vikings (the year KK was OC and still running his father scheme) I looked up all their Olineman.....all ran under a 5.0 40 yard dash. Every single one of them. When I looked at the 49ers Oline, I didn't do individual work on them but I did check Trent Williams who also ran under a 5.0 40. Now likely, it has more to do with the 10 yard split than the full distance, but the scheme obviously prefers guys who can get to their spots quickly and the 40 yard or 10 seems to correlate with their ability to do so.