The Daily Beast theory has the advantage that three of the five riders are dead, Sam and billy Tuttle, and assuming that the not seen in the present Ted Childress is dead (why go to the Sheriff who replaced Childress if Childress is available).
So that only leaves Governor Tuttle and Errol Childress to be confronted, which may be quicker, considering that they only have one hour left for torturing the Sheriff, learning of Errol, going to meet him, epic facepalming when Rust recognizes him -assuming that this will be where there will be a flashback explaining a bunch of stuff-, and a final confrontation. Add the possible inclusion of Marty's daughter/wife in the mix and the last episode will be rushed. Also, the other couple of detectives have to be dealt with. Maybe they just arrive to the shooting place late to pick up the pieces.