The Sasser trade was Sasser (25 in 2023) for Nnaji (31 in 2023), 2025 2nd (32 - Noah Penda), and a 2026 2nd. The Celtics then turned around and traded Nnaji for Colby Jones (34 in 2023) and Mouhamed Gueye (39 in 2023). They then traded Jones for Jordan Walsh (38 in 2023) and 2024 2nd (54 - Anton Watson) and Gueye for a 2027 2nd. They traded the Penda pick for Amari Williams (46 in 2025), Max Shulga (57 in 2025), a 2026 2nd, and a 2027 2nd.
So all said and done, Brad turned the 25th pick in 2023 into
Jordan Walsh
Amari Williams
Max Shulga
Anton Watson (waived already)
2026 2nd
2026 2nd
2027 2nd
2027 2nd
So still 4 unused 2nd rounders, though Sasser is clearly an upgrade on the players actually drafted to this point.