It all starts with Logan Webb, of course. He's penciled in for 4+ WAR and if he doesn't do that then the Giants are in a world of hurt. He's started 33 games in back-to-back seasons while throwing 200+ innings in both. He gets guys to hit it on the ground, keeps the ball in the yard, and doesn't give away freebies. He's one of the best pitchers in the game. He's 28 and signed through 2028.
The next guy in line is Robbie Ray. He's probably the most important person on this list!