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. It could be Peter Lambert, who offered promise in 2019 but missed all of last season after having Tommy John surgery. There are also always dark horse candidates like Chi Chi González or Derrek Rodrídguez, who both signed a minor league deal with the Rockies, and could possibly show up in spring training ready to be starters again. Finally, the Rockies could still sign a free agent or pull off a trade for another starter, but, to be honest, I couldn’t even type that sentence with a straight face or any kind of genuine hope. Here’s a good case for a veteran like Taijuan Walker. So, at least for this article, I will focus mostly on the fab four and throw in sprinkles of Castellani and Lambert, who are probably the favorites for the fifth spot at this point.