I don't think it's that cut and dried in that I assume innings pitched has some value in arbitration, just that saves are worth that much more, I assume.
His first two full years in the league he had 81 and 75 innings pitched. Since then he's never had more than 58.
How much in baseball is there where a winning player does something that they don't get paid for? There used to be a lot more of it, going in hard to break up a double play. Nobody gets paid to do that but that helped win games. Sacrifice bunts. Nobody does that anymore either but nobody got paid for doing that. In the game today it's probably stuff like hitting the cut off man, taking the extra base, taking a pitch (Chuckie hacks on 2-0). Winning players make those plays even though that doesn't increase their arby figure or their free agent contract.
That San Diego team had a boatload of talent and they didn't win jack squat. Team leaders with attitudes like Hader, Machado and Tatis Jr might explain why they underachieved.
Grumpy old man rant over.