Again, there's no rule that says the Cs have to give up the 2016 Nets pick in a trade for Cousins.
Considering Philly isn't applicable here, the Cs will be able to exceed any offer available from another team right now, even without the Nets pick in 2016.
For example:
Either: Our 2016 1st round pick (top 7 protected) or Dallas' 2016 pick, whichever is higher
Either: the right to swap with the Nets in 2017; or the Nets 2018 pick (not both)
One of: Our 2017 1st round pick (top 12 protected); our 2018 1st round pick (top 12 protected), the 2018 Memphis pick
Sullinger (considering the Cs won't wanna pay him next summer)
Zeller (considering the Cs won't wanna pay him next summer)
David Lee
And yes, I'd add in Bradley and agree to take Gay, if needed, provided we get to keep the 2016 Nets pick. This would give us the flexibility to add a pretty big FA contract next summer if justified.
Hard to imagine that offer could be beat.