Who do we have as top 6 wingers outside of Palat, Kucherov, Drouin and Killorn? I wouldn't rely on Callahan if that's who you're suggesting.
Why do we need to acquire a 2C? Filpulla can be an effective 2C when asked to be, he hasn't been since Johnson has emerged so his production has dropped. Namestnikov looks like he has 55 point 2C potential. Those are my suggestions for a 2C, not a soon to be overpaid 32 year old in Nielsen. Bennett would be great but don't see a realistic trade that works.
I suggested exposing Killorn or Namestnikov because they are the current weakest of the forwards who I would protect. If Namestnikov shows he's a 2C than Killorn is exposed unless Palat or Johnson fall off the face of the earth. Buying out Filppula is another 1.6 in dead space for 4 years that with Carle's 1.8 is 3.4 we can't have. We also don't know if Filppula needs to be protected. We also can trade someone prior to the draft when the season ends to a team who has a spot open. We have a lot of internal options for a 2C instead of looking elsewhere.