Fox never “undisputably” showed anything. His theory of “lack of resistance” doesn’t stand up to the basics of the battle.
Fox claimed to have found “not enough cartridges on the battlefield” although he knew that thousands of artefacts had been collected since 1876 by relic hunters. I personally know people who picked up hundreds of bullets and cartridges on the hill. So analyzing a “contaminated” field and drawing conclusions on a lack of material is useless - and destroys Fox’s credibility. Moreover, the Indian testimonies clearly don’t back Fox’s theory at all.
Indian forces never numbered 4’000, but 1’000 to 1’500. The “4’000” myth was created by Benteen and Reno to cover their own asses and their betrayal.
Custer attacked 1’000 warriors with 650 soldiers. He lost the battle because of these 650, 400 never supported him because their commanders, Benteen and Reno, refused to do their duty and commited high treason against their superior and their flag.
But you are welcome to perpetuate the myth.