Based upon that report, it still seems like there are a lot of moving pieces.
I would be absolutely shocked if Al Harrington's presence is the decider in whether Carmelo accepts or declines an extension. Harrington's presence on the Nets would actually make them less likely to win in the long term (and arguably, in the short term as well.) If Carmelo wants legitimate pieces to join him in NJ, I can't see a lot of guys on the current Nuggets fitting the bill, outside of maybe Chauncey.
The Harrington part is probably a miscommunication between sources. I highly doubt he is part of it to make Melo happy, I think he is part of it to make Denver happy...perhaps in lieu of sending extra assets that can then be used to get talent elsewhere.
So, perhaps it is something like Melo and Harrington for Murphy, Favors, Sasha, and 1-2 picks (instead of 3-4 picks).
And then they will use Harris, Morrow, and other salary filler, plus more of those picks to get that other piece.
Heck, why not send Harris, Morrow, and 3 picks for Chris Paul? I know with the league owning NOH, it would scream of collusion, but that would be a pretty nice haul (particularly with Paul's injury questions), and it certainly convince Melo to resign.