We are in three competitions, including playing Thursdays in the Europa League, and there is no way that Saka and ESR can play every match or anywhere close without burning out given their ages and histories.
In terms of formation, I think it is simple. We have settled on a 4-2-3-1 in which the CAM and RW are technical creators and the LW and CF are more direct, goal scoring players. Saka, ESR, and Odegaard will rotate in the CAM and RW positions. Auba, Laca, and Martinelli will rotate in the LW and CF positions.
Hopefully this means we won't have to see Pepe, Willian, Nketiah, or Nelson very much.