In looking back at the beginning of this thread, the title is best Pacific fighter. I would interpret this as most capable not most influential. If we were trying to identify most influential or important Hellcat might be the one although the Wildcat might be a better pick. If not for the Wildcat the early Pacific battles won by the US might have gone the other way. Just think about the USN fighting in 1942 with the Buffalo in stead of the Wildcat. However the thread is about BEST PTO fighter. I would suggest that means best all around. The test of the F6F5, F4U1D versus Zeke 52 has been quoted since in that test the Corsair was only 4 mph faster than the F6F5 AT BEST ALTITUDE. I went back and looked at the test and although the F4U1D was only 4 mph faster than the F6F5, the test against the Zeke as to climb and speeds at SL, 5K, 10K, 15K, 20K, 25K, and 30K showed that the Corsair outperformed the Zeke in all those categories substantially better than the Hellcat did. Incidently, the FM2 was in that test and the Zeke 52 beat it pretty soundly. I also reviewed the test between an F4U1, F6F3 versus an FW190A4 and the Corsair showed a marked superiority over the Hellcat although both would be able, according to the Navy, be able to cope nicely with the FW, if flown to their strengths.
To try to put the legendary, famous or infamous "weakness" of the Corsair, the oil cooler, in perspective as well as the difficulties in landing, because one has visions of Corsairs falling out of the sky everwhere with oil coolers polluting the atmosphere and poor ensigns crashing on every other landing, let us look at some numbers. The Hellcat had 12275 built during WW2. They flew 66530 combat sorties. 553 were lost to triple A, 270 were lost to enemy AC,and they had 340 operational losses. They shot down 1445 enemy bombers, 3718 enemy fighters and dropped 6503 tons of bombs. The Corsair had 11514 built in WW2. They flew 64051 combat sorties. There were 349 Corsairs lost to triple A, 189 shot down by enemy fighters, and had 230 operational losses. They shot down 478 enemy fighters, 1662 enemy bombers and dropped 15621 tons of bombs. Based on the record, I submit that, as far as operational losses are concerned and as far as the famous(infamous?) oil cooler weakness is concerned there is no material difference between the two fighters. I also suggest that if the USN had gone on and deployed the Corsair on carriers as originally was intended, along with the Hellcat when it became available, the operational losses of the Corsair would have been higher but that would have been more than offset by it's performance advantages over the Hellcat. I also wonder why, if it was discovered in 1945, that the oil cooler was an Achilles Heel for the Corsair, that the Navy or Vought or Harry Truman or somebody did not relocate the oil cooler in the F4U4s and 5s built post war as was done in the AU and F4U7?