1) This takes place before RDR2.
The first part of the game will be played as Lyle Morgan. However, this will be a small part of the game and the rest of it will be played as Arthur and the game will end just before the Blackwater hesit.
2) This takes place also before the events of RDR2, but between 1890 - 1898.
John will be the protagonist and we'd see the birth of Jack, and the one year disappearence of John.
3) This takes place between 1914 - 1915.
It is all playable as Jack Marston and he wants to eliminate all the Pinkertons so he is forced to travel in several countries in the US.
Tell me your opinions in the comments!