I don't see us trading Casas, either. The chances are so close to zero, mentioning it is pointless. Trading Duran and or Dugo might happen, but Dugo is our best defensive OF'er, this year, not counting the soon to depart Duvall.
Casas and Duran have trade value. Yoshida might have a little, if we pay 20-30% of his contract. To me, we can't improve the D enough by playing those 3 in the field, nearly everyday.
With Turner leaving, we have room to park one of them, or alternate Casas and Yoshida, there, but we'll still suck at 2-3 positions, again.