I know Lee has not shot well this year and not developed as NJ hoped, but he is still a cost controlled guy with some nice potential for a team looking to retain those low priced guys (with relatively high value) while maximizing cap room. I can not see NJ dealing a guy like that even if the theoretical trade-off is that first round pick (and saving money on Najera). Najera's deal is mostly guaranteed but NJ could get out of some of it if the cut him before before next June, so their savings is more like $5M than $6M, not that they would not like any additional cap room.
NJ has Devin Harris, Yi, Brooke Lopez, Terrence Williams, Lee and CDR wrapped up for a total of $20M next year, a pretty nice situation of a decent young group to go get a couple of big names to be the centerpieces. Not that anyone except Lopez is untouchable, but they'd need to get quality back if they move any of them.
The only nuisance contract is Najera, as Dooling has a small buyout for next year, and even Najera's issue is a pretty small one.
For the Cs, I think they'd feel that losing Daniels pretty much negates getting Lee as well.
Not sure it works for either team. Although I do think something involving NJ and some combination of Alston, Dooling, Najera, Hayes, and Sean Williams is one of the possible trade scenarios, albeit not a particularly awe inspiring one, and injuries to a lot of those NJ guys have lessened these options. If the Cs take Najera, they can probably have Alston or Dooling for whatever works in contract matching.