This season Luis Castillo has posted 1.0 fWAR in 110.2 innings while Sean Manaea has posted 0.9 fWAR in 104.2 innings.
Steamer and ZiPS project Castillo with rest-of-season WAR of 0.6 and 0.4 in 45 and 39 innings while projecting Manaea with ROS WAR of 0.5 and 0.3 WAR in 43 and 28 innings.
Before the season the ZiPS three-year projections had Castillo with 1.9, 1.5 and 1.0 WAR in 2026-28 and Manaea with 1.1, 0.7 and 0.3 WAR in 2026-28:
https://www.fangraphs.com/players/luis-castillo/15689/stats/pitching#zips-3-year-projections
https://www.fangraphs.com/players/sean-manaea/15873/stats/pitching#zips-3-year-projections
Castillo has a 2027 salary of $24.15 million with a 2028 vesting option for $25 million if Castillo pitches 180 innings in 2027 and passes a physical.
Manaea, who is 10 months older than Castillo, has an average annual salary of $25 million under his three-year contract, but has a 2027 salary of only $19.2 million with a luxury tax assessment of $22 million:
https://www.spotrac.com/mlb/player/_/id/19022/sean-manaea
This week Castillo struck out 10 over seven shutout innings as the first-place Chicago White Sox blanked the Cincinnati Reds:
https://www.mlb.com/news/luis-castillo-has-season-high-10-strikeouts-in-white-sox-win-over-reds