That's arguable - there is no doubt the US Navy and Marine Corps had a huge role in sustaining Japanese expansion in the PTO I think you need to examine where and when they made a difference, and equally across the board with the AAF 5th AF. The 5th AF had bomber and attack aircraft that brought more bomb tonnage to target than what the Navy and Marine Corps were capable of during the early part of the way, especially when the Navy was down to one carrier.
They also had the advantage of being placed in target rich environments being operated from aircraft carriers
That's your opinion.
The F4F, P-39 and P-40 held the line, the P-38 gave the AAF to expand the line, as did the F4U and F6F. You also have to consider when we had carriers available to support the later.
Ans so do opinions...
All reasonable... good point about the bombers of the 5th AF too, F4Fs and even SBDs weren't as effective against ground targets though TBF came in handier there. 5th AF may have even shot down more enemy planes by say, end of 1943, but I think the Navy killed the most elite Japanese pilots by that same timeframe. And did it mainly with Wildcats.