The camera too shows there is one. Slow motion camera means every cricket fan watching it on Murdochvision can see when the ball starts to swing.

A ball that wears loses shape and becomes less concentric, hence accentuating whatever effect there is. We can see that it happens, hence the only thing missing is an empirical formula for predicting it. As I said earlier, there are ordnance calculations that take air humidity into account for bullet trajectory, but they are based on the premise that a bullet hasn't been roughed and smoothed.....