Stats go almost far enough back these days.The point is Butler was always an elite mod-range shooter.
At Marquette:
His freshman year wasn't tracked.
His sophomore year he shot 33/105 on "Far 2s", which is 31.4%.
His junior year he shot 61/166 on "Far 2s", 36.7%.
Far 2s include anything that isn't a layup, dunk, or tip.
He got to be really good around his 4th year in the NBA.
Castle his freshman year was 23-66, 34.8%. Not great, but nothing to say he can't follow Butler's track.