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Consider, as one data point, the combined in-season bWAR of the top five players traded at recent deadlines:
Deadline, Indeed (top five bWAR at time of deadline trade, 2021-23)
2023 12.9 (Candelario, Civale, Giolito, Montgomery, Verlander)
2022 14.9 (Soto, J. Bell, L. Castillo, Benintendi, Drury)
2021 17.7 (Gallo, T. Turner, Scherzer, K. Gibson, Frazier)