While I agree that Morrissey Pionk is not a good pairing, it's funny to call De Melo a bigger tougher stay at home d, when he is constantly getting run over because he isn't big.
I don't think any of the top 3 d-men are available. One because of contracts, two because of roles.
One thing I'm looking at is the emergence of Samberg as a legit PKer, do the Jets move De Melo while the time is right? He's an offensive black hole, if he gets the puck anywhere below the cirlces you almost instantly expect a turnover. His defensive awareness is pretty good, but at what point do you want a defense attacking and not defending?
Give me Morrissey-Heinola, Dillon-Pionk, Samberg-Schmidt, are the Jets better than with De Melo? That's a tough call, but I think so. If we could get a RHD prospect back, or Kovacevic back for depth, I'd move De Melo first, because he's to me the opposite of Pionk, pretty good advanced stats for mediocre results, whereas Pionk will get you offensive chances and points with mediocre advanced stats.