This explains why children have an easier time catching faster balls. Because the high speed triggers different regions in the brain, they catch fast balls using a different mechanism than they use to catch slow balls.

This deepens the mystery. If balls tossed slowly are less likely to be obscured, children should catch them more easily.

This refers to adults, not children. It is not implied that the catching abilities of adults are aligned with or opposite those of children.

This refers only to children’s ability to throw balls accurately, not to catch them. It does not explain why children find balls easier to catch when they are coming in faster.

This limit does not explain why children more easily catch faster balls in general. It introduces a separate phenomenon at higher speeds, without explaining the phenomenon at hand.