My data is myself and a buddy of mine.
He returned to lacrosse one year explosive. Asked him what he did. Went to speed camp.
Did the same that summer. Also became one of the fasted players on the team, and I started with cement in my cleats.
Speed can be coached. Box jumps, depth jumps, bungee runs, foot speed drills... different people have different ceilings.
At the D1 level, maybe the ceilings are a bit comparable. High school may be a bit different I suppose. In context you may be correct here. At lower levels I think there can be exponential growth more than just a tick.