Why the Warriors do it:
Iguodala brings the defense from the 3 among the best of them. Jrue Holiday is a pretty efficient young guard with a desire to learn the game and play defense.
Why the 76ers do it:
Elton Brand is old and they don't have an reliable big to lean on. Stephen Curry was once alone worth both these players.
Why it probably won't happen:
Both the players the 76ers would be getting in this trade are currently injured. Lee's injury isn't serious but the rest of the league might not have as much confidence in Steph as we do. Not every front office is as willing to deal for injured players as much as we are.