It now appears that the Denver Nuggets are the side keeping a deal from being consummated, according to All Iannone:
The Nets are having a harder time getting a commitment from the Denver Nuggets than they are Carmelo Anthony.
Al Iannazzone
Al_Iannazzone
The Nuggets need to make a decision on a Melo trade before they reach the point on no return and wind up with very little. This current deal is top notch.