Okafor makes sense because he will cost less than Butler/Cousins/Westbrook/Love and because he is younger and he is still on his rookie contract. Plus he fills a major need: size.
Rozier, Olynyk, and non-Nets pick, Young, Zizic, (basically any asset not named Crowder, IT, Smart, Bradley, Brown, Nets picks, Horford )... And it would be an absolute steal. Question is how good is Rozier and how badly does Philly want to move Okafor?