You hit it closest, Terry and Skipper. Coordinating attacks such that 4 or more were aimed at an individual ship at the same time. Individual anti-aircraft fire control could not direct fire at more than 4 targets at one time. The Japanese failed to swamp a single target ship (most of time, picket DDs excluded) such that the ships had a far easier time shooting down diving aircraft than they would have had multiple aircraft made their runs at the same time.
The root of this failure falls back on the profound lack or training, due in no small part of the catastrophic successes of the US submarine service in sinking Japanese tankers.
Y'all can fight over who asks the next Q.
