It's no secret that the Houston Astros need to move an infielder this winter. Between Carlos Correa, Christian Walker, Isaac Paredes, and Yordan Alvarez, there are four bodies for three spots if you include DH.
At the same time, the Astros have a lot of holes elsewhere that need to be filled. The biggest area of concern is the starting rotation. Despite Framber Valdez saying he'd like to be back in Houston, it's likely not in the cards for a multitude of reasons, with financial being at the top of the list.
What Houston would love to do then is trade away Christian Walker to free up first base for Paredes while getting some salary relief.