The rationale is 76ers want Grant so give up expiring contracts and picks.
Blazers flip those contracts for contracts that expire a year later which probably fits their rebuilding timeline better for an extra pick and THJ who is a piece that could be flipped for more picks.
In what is essentially a separate move between Mavs and Bulls but added in this as could be picks and players flipped around.
Bulls get two young players, a 1st and 2nd to kick off their rebuild and suit the timeline of Coby White and Patrick Williams.