Why they do this
Magic
They try to stay competitive this year. Moving on from Fournier and Gordon may be the easiest way to do this
If they can resign Oladipo after the season (not unlikely) rotation in 2021-22 season could be: Fultz, LaVine, Oladipo, Isaac, Vucevic --- Anthony, Ross, Ennis, Okeke, Birch
Easily fit into Steve Clifford's defensive coaching style
Houston
Add a more perimeter-centric player on a cheaper contract.
Still an expiring contract, so they free up just as much cap after the season
Bulls
Try to save a bit of cash long term, move in direction of younger core.
Bamba could slot immediately into starting rotation, and give them the option to sign him at the end of the season
Gordon is on a declining contract (~$16 mil next season), so they'll have more cash to spend in the offseason on role players