I think Robb’s math is slightly off. Since the Celtics would be a taxpayer team after such a trade as he describes, they could only take back 125% of Thompson’s salary, not his salary plus $5 million, so $12.25 million. This puts us in Nance and Kyle Anderson territory, but not most of the other players he named (I can’t see Bagley being someone who Stevens would be interested in given his concerns about consistent effort and maturity).
That said, salary filler like Carsen Edwards would get us the rest of the way there for the guys on his list.