Raiders the odd man out? I couldn't disagree with that comparison more, LC is by your own admission a cheap knock off, but because of that they fit togeather fine.
The way I see it is you have CS and TOD, which are more Jungle focused and over the top bookends and dealing with occult sort of themes, with a young sidekick etc. Both also find Indy at his most skeptical, TOD being a young brash gimme the fortune and glory guy, and then old Indy questioning if its all even worth it anymore.
Then Raiders and LC sandwhiched in there, which take place during WW2, are heavily desert themed, and have a detirmined to make a differance Indy race against the nazis for the religious based prize.