I agree overall, but I think if you can move Dumba for a comparable forward before the expansion draft you have to consider it regardless of position.
Parise, Zuccarello, Fiala, Eriksson-Ek, Greenway, <Dumba trade>, <another forward>
Suter, Spurgeon, Brodin
Kahkonen
You lose someone like Soucy or Foligno to expansion and should be able to fill the loss by promoting a prospect. Maybe the forward you got for Dumba is around long term or maybe they're part of a deal for a center, but worst case you're "stuck" with another skilled forward and didn't lose a high-value player for nothing.