On the heels of the great news of the Rockies signing Antonio Senzatela to a one-year $3 million deal earlier in the week, it seems like a good time to take a close look at the rotation heading into 2021. Before jumping into the details, it’s important to confront one major problem: the rotation is not complete because isn’t officially set. We know Germán Márquez will lead the way, followed by Kyle Freeland, Antonio Senzatela, and Jon Gray, but that fifth spot is a scary, dark mystery. It could go to Ryan Castellani, who’s coming off a brutal welcome to the majors in 2020.