One wing short of what?  We have three point guards.  Hayward and Burks and the rookie 2nd rounder at the 2.  Williams and presumably Carroll and Evans (though he plays 4 more I suppose) at the 3.  Plus obviously Hayward and to a lesser degree, Millsap can play the 3.  
I'm not saying we couldn't upgrade at the 2 or the 3 but I'm curious what you mean when you say we're one wing short.  As currently constructed, this team has no time for a new wing to take more playing time away from Burks.  Oddly enough, one thing I'd look for in a trade of Jefferson (or Millsap--sigh) is a 4th big back, specifically a 5. That wouldn't be the key piece in the deal.  Just an afterthought.  But I'd still like that.  Someone who won't expect much playing time.  Yet someone who's solid and would help us retain our depth up front.