* Guardians beat the Red Sox by a little in UZR, Red Sox beat the Guardians by a lot in DRS ... both teams added value defensively
* Guardians play in the 3rd best hitters park in the league, Sox play in the 4th best park in the league ... both pitchers played in hitter friendly home parks
* The competition thing is legit - although I have not looked at the start by start
K/BB ratio correlates well because strikeouts correlate well ... the walk component does not correlate much one way or the other.
I don't actually disagree with Porcello as the Cy Young winner - there are four good candidates and he is one of them. He and Kluber have - essentially - identical park adjusted ERAs (ERA+ or ERA-, both are really close), and they allowed an equal number of runs per 9 innings (ignoring the "Earned" portion - since assignment of earned vs unearned runs is in general a bit of a mess). Porcello pitched 8 more innings, but from a bulk prespective, again, both are pretty close.
Where they differ is that Kluber struck out more hitters, and (at least from a couple of studies) got a little less defensive help than Porcello did relative to the quality of contact. I note that bWAR, which starts with runs allowed and adjusts from there, has Kluber and Verlander with a significant lead on the AL field - which is noteworthy. Porcello had a marvelous season, and if he won, that would be okay. He has quietly transitioned from being a groundball pitcher into one who strikes out more hitters - there is nothing bad to say.