With offense at a premium for a team that posted historically bad numbers against lefties, the Cubs had to lean on their rotation to carry them to a postseason berth. Not that it mattered against the Marlins when the bats went cold enough to store Pfizer’s coronavirus vaccine. Bringing three full-time starters back, presumably having an improved version of Adbert Alzolay for the whole season, and maybe even facilitating a reunion with Jon Lester means the rotation appears on the surface to be a strength yet again.