Gonna leave this here. I was tracking this over the course of the series, and didn't know until tonight that the Guardians actually hired the guy who found this effect. In game 4, I flagged Holton vs. Ramirez and Brieske vs. Fry. If guys like Holton, Brieske, and Vest started leaking oil toward the end of the series, it may be this effect.
https://www.theringer.com/mlb/2023/10/27/23935127/world-series-preview-texas-rangers-arizona-diamondbacks-bullpens-repeat-reliever-effect