Wouldn't the Lakers get a massive trade exception in this deal?
Incoming - Dwight (19m), Harrington (6m)
Outgoing - Gasol (19m), Bynum (16m)
That's a difference of about 10 million. Or they might figure out some filler to throw in (like Josh McRoberts' expiring), make it two separate transactions, and get a trade exception for Bynum's full salary.