Hear me out.
In red dead 2 when miss grimshaw kills molly she said “there are rules Arthur.” Well how are these rules made? A few dialogues between characters states that there was a traitor in the group a while back. What if this traitor was Red Harlow. After he avenges his parents he could join the Van Der Linde gang. He could eventually see Dutch in the way Arthur sees him at the end of rdr2. Red could then become that traitor that was mentioned. Then Rockstar could remaster all the red dead games to be the same graphics as the 3rd one. They could have all the games become one big game that takes place over the course of many years. They could also combine the maps this way. Red dead 4 could be played as Mac Calendar. Milton tells Arthur that Mac was executed. Milton could have lied about this and told Arthur this to make Arthur give up the gangs hiding spot. Red dead 4 could have the events leading up to Blackwater, Mac’s escape, then him trying to find the gang. He could go looking for the rest of the gang and whenever he finds their hideout it is too late and the gang has moved on. Then Mac could eventually find some of the people after Dutch’s betrayal. They would tell him that Dutch turned out to be a bad man and Mac could go live his life.
Also just a good idea, rockstar could make a game where Jack Marston gets drafted for WWI. He could be trying to dodge the draft and he eventually gets captured. They could have a chapter where he fights in WWI then escapes (similar to the Guarma chapter). Then he could start a family and live happily ever after. And GTA could have references to some of the characters being relatives of the Marston family.