Why did Cubs not want to keep Willson Contreras?

Foresight 2020: Can Willson Contreras maintain his 2019 form? - Marquee Sports Network

Cubs' Contreras keeps focus on baseball, blocks out contract extension talks, trade rumors

Cubs Trade Rumors: Teams Worry How Willson Contreras Would Mesh with New Pitchers, News, Scores, Highlights, Stats, and Rumors

Cubs' Happ hits Cardinals catcher Contreras in head with follow-through, then gets hit by pitch - The San Diego Union-Tribune

Chicago Cubs Rumors: Decision made already on Willson Contreras

The Cardinals need to sign Willson Contreras this winter, by Jacob

Willson Contreras embraces villain role as he helps take down Cubs in his return - The Athletic

Willson Contreras Is Day to Day with an Undisclosed Issue - Bleacher Nation

Contreras orchestrates heel turn as Cubs lose to St. Louis

Cardinals get their new catcher, ex-Cub Willson Contreras

Willson Contreras, Ian Happ stay put at deadline as Chicago Cubs fail to find 'motivated' trade partner - ESPN

Willson Contreras has interesting quote comparing Cubs and Cardinals