The Moncada situation is kind of like the Bellinger situation.
Bellinger was even better than Moncada. Bellinger was a 4th round pick so he didn't come with the hype or expectations of Moncada. His 1st 3 years his fWar was 3.9, (ROY) 3.8 and the MVP yr was 7.7 in 2019. 2020 Covid shortened season 1.6. His downfall can probably be linked to a couple dislocated right shoulders diving for ground balls playing 1st base and celebrating a HR and his subsequent shoulder surgery after the 2020 season. His fWar 2021 (-1.0) and 2022 (1.3) seasons . Dodgers total investment
The Dodgers paid him $1.8M for his 1st 3 seasons .After that he was $11.5 M in 2020, $16.1M in 2021 and $17M in 2022. Total investment $46.325M. The Dodgers did not extend him . His higher salaries were due to arbitration. He is now 27 yrs old and likely to be non tendered.
Moncada: Let's start with his salary . $31.5M signing bonus by the Red Sox who then had to pay 100% Tax making their outlay $63M. 2017 $535K, 2018 $555K, 2019 $575K at which was his breakout season w/ 5.5 fWAR.
Early March 2020 The Sox signed Moncada to a 5 yr. extension worth $70M with a team option for 2025 . That $70M includes the 2025 buyout. Between his signing bonus with the Red Sox and his extension with the White Sox Yoan will have collected $103.165M guaranteed . $71.165M from the White Sox.
4 months after signing the extension Moncada got Covid. Was Hahn to blame for signing a player to an extension in the middle of a pandemic ? Did they know Yoan's personal life and did that personal life lead to getting Covid ? Is Covid to blame for his downfall ? Is it lifestyle ? Effort? or more injuries ? He seems to be hitting well from the RH side this year when he's always been better LH. Is the oblique still hampering his LH swing.? That injury happened in the last game of Spring Training so quite a while ago. He's also been hampered by quad and hamstring problems and seems very good at fouling pitches off himself.
So the Sox have invested quite a bit more in Moncada than the Dodgers have in Bellinger and the Sox can only Hope Moncada can rebound because they can't non tender him.
Bellinger also has more fWar in his career , both are 27 and both have had injuries and struggles at the plate either because of them or the usual other baseball reasons for hitters losing it.