Pau isn't being traded. A Nash/Pau pick and roll is deadly. Pau is money from mid range, Nash can easily drive and dish/alley oop to Bynum (or Dwight hehe), get his own layup, or kick it out to an open (assuming the D collapses on Nash, even though they'll be smart to stay on Kobe) Kobe or MWP for a 3.
Lakers are gonna be deadly this season regardless if we keep Bynum or get Dwight.