For what its worth, other than Kevin Long, these are the hitting coaches participating in the World Series--
Phillies Asst Hitting Coach:
Jason Camilli -
https://www.baseball-reference.com/bullpen/Jason_Camilli#:~:text=In 2021 he moved to,coach of the Philadelphia Phillies.
Astro Hitting Coaches:
Alex Cintron -
Troy Snitker (son of Braves manager Brian)