Tbh I think he would’ve died sometime before RDR1 even if he wasn’t shot on the mountain because he was a very reckless and trigger happy outlaw so he would’ve either been killed in a gunfight or been hanged also I doubt his gang would’ve been entirely loyal to him and most would stab him in the back either to collect the no doubt massive bounty on him or to save themselves

He would have most likely turned in Dutch to Ross.

But, Ross would kill Micah (similar to what he did to John).

Dutch would’ve been turned in, and John never would’ve been forced into hunting down his former gang members by the pinkertons