It’s just FIP.
Sabathia throws more ground balls, Verlander gave up more home runs in a more favorable park, and Sabathia had a much higher BABIP. Verlander’s was freaking .236.
Same explanation gives you Halladay over Kershaw in WAR (over everyone, in fact).
The thing is, I actually agree with the Halladay over Kershaw argument. I think Halladay was the better pitcher this year. Better ERA+, better SO/BB ratio - just played in a tougher ballpark and had worse luck (.305 BABIP for Halladay, .274 for Kershaw).
Note that both versions of WAR have Halladay ahead of Kershaw - only Fangraphs formula has CC over Verlander.