Major acquisitions that took place during Lebron's time in Cleveland (2003-2010) included Gasol being traded to the Lakers, Kevin Garnett and Ray Allen going to Boston.
I think if the Cavs had gotten Gasol or Garnett in a trade even if it meant giving up Big Z and Varejao they would have won...
After Knicks got Amare, Heat got Bosh and kept Wade, and Bulls got Boozer it seemed like the Nets were out of this. Also they won 12 games last season.