Honestly, part of the issue is that the 2019 season was a mirage due to the bouncy ball and spider tack.
Eloy's ground ball rate was always a red flag, Giolito was never the same after the spider tack ban, Kopech was a headcase and Moncada got destroyed by injuries and long covid.
Furthermore, Anderson lost his power in his 30s and it took the league 5 seasons to figure out Robert can't lay off a slider in the LH batter's box.
For me, Moncada is the biggest what if? because he had elite exit velocities before his bout with covid. He lost bat speed and it never returned. But it is possible that was due to the baseballs they used in 2018-19.