It's not impossible that the star in a World Series-winning season is The Rotation. But it's been 20 years since over half a world champion's best regular season players were pitchers.
Based on the Top 8 bWAR of annual champs, the 2005 Chicago White Sox were the last to feature 5 of 8 on the mound. That includes their Big Four starters who threw four straight complete games to win the ALCS (after an ALDS sweep of the Red Sox).
Since '05, only one other ring winner has had as many as 4 pitchers outright among its top 8 bWARs... you guessed it -- the 2018 Boston Red Sox: Sale, Price, Porcello and Rodriguez.
There's no Mookie this year, but there's an Anthony. And there is a JD. But while monitoring the BoSox' trek back to the top, check their bb-reference page often, and the mugshots from left to right --- if at least 4 of the top 8 WARRIORS include the likes of Crochet, Suarez, Gray and Bello, plus even Chapman again, we could be alright...