Personally I think they should of let Mozgov walk/S&T him instead of trading Koufous as Koufous is younger.
Considering that he signed for less than the MLE, I don't think there was a huge market for Mosgov. It's tough to pull of a sign-and-trade when no one wants to sign him to begin with.
The Nuggets were going to match an offer sheet for the full MLE, so it was generally pointless for a team to negotiate with Mozgov unless they could offer him enough money that Denver might not match. If he were an unrestricted free agent, someone would have signed him by now.
The teams with the most use for him are probably the teams with the worst assets to trade for him. The Spurs were supposedly a team that had interest but couldn't put together a suitable trade offer.