Blake Snell and Luis Castillo, who were born eight days apart, have each made 211 starts in their MLB careers.
Snell has posted 24.5 fWAR and 23.4 bWAR over 1,096.2 innings while Castillo has posted 23.9 fWAR and 24.0 bWAR over 1,230 innings. Over the past four seasons Snell has made 103 starts while Castillo has made 121 starts.
The disparity in their 2024 production cannot be ignored but at what point does recency bias enter the equation? Over the three previous seasons, including Snell’s 2023 Cy Young campaign, Snell posted 9.9 fWAR and 9.7 bWAR in 83 starts while Castillo posted 10.9 fWAR and 11.5 bWAR in 91 starts.
Would Castillo waive his no-trade clause to join the Cubs?
Snell may well have the higher ceiling but Castillo has been more durable and reliable. Each quality provides value. Given the deals landed by Snell and other starters this offseason, Castillo’s contract is not underwater.