Pearl Harbor was a waste of two plus hors of my life. So many technical and historic mistakes I nearly walked out in the middle of the movie. Will never watch it again.
I believe the name Jug came from the fact that the early marl 47 fastbacks looked lie a huge jug. remember this was the 40s and the us was still fairly rural.
Everything I've ever read suggests the F6 was a stand alone design meant to give the Navy an easy to produce aircraft that could match the AM-6 and was carrier capable which they still weren't sure the F4U was.