Every comment I see on a RDR video, expresses a RDR3 with either Mac or Davey as playable protagonists. Now don't get me wrong, I would love to see the Callander brothers considering the gang members talking about them same as Jenny Kirk, but I don't think they would be anything interesting as playable characters. They are not like John, Jack and Arthur as playable characters. John wished a better life for his family and tried to leave the criminal life and mostly succeded and got redemption when he sacrificed himself to let Abigail and Jack leave and live. Jack following his father's death and his mother's death shortly after, became a broken young man who became the very thing his parents and the other gang members didn't want him to become. Arthur began to regret the choices he made after Hosea's death, him realizing Dutch's change in character, the gang falling apart and him finding out of his illness (Tuberculosis) and wanted to get those who still had a possible future to get out and start a new life somewhere else, hence why he helped John, Abigail and Jack to get out as well as helping Mrs Downes and her son Archie after Thomas Downes' death which was caused by Arthur himself, Beau Gray and Penelope Braithwaite and others like Charlotte who he helped to survive alone and later helped John get to safety before holding off the Pinkertons, Micah and Dutch from getting John. Davey and Mac is nothing but a vicious pair of bastards according to Charles in Chapter 6 during the mission "The King's Son." The Callander boys for me aren't interesting enough to be playable characters like Arthur, John and Jack was.