Very few of their players were acquired in the type of firesale trade that people here are suggesting.
Syndergaard and D'Arnaud obviously, but the majority of that team was acquired because they drafted and developed the talent (Harvey, DeGrom, Conforto, Matz) or made the opposite kind of trade where they traded prospects for guys like Cespedes. If anything, they also relied on aging stars longer than they should have in Wright, Colon, etc.