In the Gun Digest article I mentioned, the author opined that he believed Johnson did not eat the liver..that came about after he killed a Crow with a knife, dug out the liver, and made mention to another white man about eating it.
He later bacame a lawman, and he was in his 60's ( I believe, maybe 70's ) when he disappeared while alone, it is surmised that the Crow finally got him. If he was taken alive, I'm sure his death did not come fast, nor easy !!
I think, all-in-all, he was about on a par with other frontiersmen of his era, tough, realistic, and elevated after death to almost mythical standards.
Mark