Saving Japanese pilots changes the Guadalcanal choice

Would saving trained Japanese pilots after Guadalcanal improve results at the Philippine Sea?

Yes, but doing so requires a different Guadalcanal strategy, so the wider campaign changes before the later carrier battle.

Preserving trained pilots would give Japan a stronger air group for the Philippine Sea. The counterfactual cannot isolate that later benefit from the earlier campaign that consumed the aviators. Withholding them means reducing air support for Guadalcanal or deciding not to contest the island in the same way. That choice changes operations across the South Pacific before the surviving pilots ever reach another carrier battle. The trade is therefore between immediate campaign effort and a more experienced future carrier force, not a free addition to the historical order of battle.