Who was REALLY killed by Pat Garrett in 1881?

[devinb]

I'm new to this mystery—well, OLD with regard to an amateur forensic analysis of Billy's iconic tintype and the image allegedly of "Brushy Bill" a few years later (clean-cut, moustached) in 2005.



I'm convinced the people in that iconic tintype AND the clean-cut, moustached man are the same guy. Given this, I wonder—if Billy wasn't killed by Pat Garrett in 1881, who was? And why the elaborate cover-up? Was Pat Billy's friend (as fictionalized in "Young Guns 2"), providing Billy the perfect new start—OR was Garrett involved in a case of mistaken identity, murdering an innocent man, lying about his true identity, burying him and cashing in on a lie?

[searcher64]

i can't see how garrett and billy were friends after all the killing. if this billy barlow was a cousin of john wesley hardin, that would be a big factor prompting the cover-up. who in the west wanted hardin after them?