Why would LeBron go to Jersey to play with the existing Nets team plus Derrick Favors or Wes Johnson? If they'd had a top 2 pick and guaranteed themselves either Wall or Turner I could see him going there, but that #3 pick basically eliminated them from the mix.
They would take Cousins before both of them if they were smart. Cousins might have "brain farts" as I like to call them, but he is a 19 year old. He is only going to mature (which he actually did during the later part of the year at Kentucky).
The Nets have the talent, they just had too many bad breaks. Harris, Lopez, Williams, and Lee all have some type of skill. You take that base, plus Russian Mark Cuban (that's what I'm calling him for now until I can fully remember his name) and the deep pockets he will have, add Cousins or Turner (if Philly really passes on him), his relationship with Jay-Z, and the move to Brooklyn in 2012, I see no way why LeBron couldn't go there if winning is his top priority (and look at what he did in Cleveland with what he had for help).