^^^ Exactly. Six of the top eleven pitchers in Win Probability Added so far this season are relievers. It's not just the top end of the WPA leaderboard either, scroll through & you'll see relievers mingling side by side with starters in terms of actual impact on wins & losses (as opposed to context neutral WAR). Sure, a true ace is still the most valuable commodity in baseball. But as we know there's maybe a half dozen of them in the game at any given time. Meanwhile guys like Blake Treinen, Lou Trivino, Seranthony Dominguez, Yoshihisa Hirano & Kirby Yates (plus Hader, Jeffress & hopefully Burnes for the rest of this summer) can have a similar impact by being employed consistently in high leverage situations. Comparing Burnes & Peralta's WPA totals this season illustrates just how impactful a carefully deployed reliever can be. In his 7 starts & 37 innings Peralta has a WPA of 0.39. In his 3 relief appearances & 6 innings Burnes has a WPA of 0.45.