We will be replacing Perez, Richards, Ottavino, Marwin & Santana with something that almost can't be worse. They don't need to be "major additions," just better than those clowns.
We may have more injuries, but Sale, Houck, Kike and Arroyo for the full season may make up for them. Plus, we likely won't have a COVID catastrophe, next year.
You can keep calling this an over-achieve and the Yanks an under-achieve all you want, but repetition does not make it any more true.
This "career year," and it's good to see you now added "on par years" is just not true. This is not like 2013. Since when is having an "on par" season in the meat of your prime years something unexpected?
Career Years:
Eovaldi
Renfroe
Kike (very close to 2018 season, but I'll give you this one)
Arroyo (out so much, it barely mattered)
On Par:
Bogey (Better in 2019) in the middle of peak prime
Devers (Better in 2019) entering meat of prime
JD (one could argue he did below a normal age curve projection)
Pivetta (Close to career year)
Schwarber
Plawecki
Taylor
DHern
Barnes
Perez
Down or below expectations:
ERod (in a big way)
Vazquez (150 points below '19-'20 OPS)
Verdugo (50 points below '19-'20 OPS)
Marwin (150 points below his career OPS)
Richards
Ottavino
Sale
Santana
Cordero
Chavis
Too early to know:
Whitlock, Houck (better in '20), Dalbec, Duran
Even if you put Pivetta in the over achieve category, I'm not seeing anything close to what you are.