Trading away Driver and Lee for Marshall would be a stupid move. As others have stated, DD and A Rod have made the "connection". Driver is still the most underrated WR in the league, he will never get the respect he deserves on the national level, but part of that is because he is a humble, hardworking man that just goes about his business without trying to draw too much attention to himself.
Sure, Marshall is a supreme talent. But he is also a supreme egomaniac. We don't need the disruption, and it would risk tearing up the carefully orchestrated chemistry that we currently showcase on offense.
Now, if the Broncs just want to dump him, I would wave Harrell under their nose along with Brohm, and Hawk. To me, the first two are disposable, but they might be worth something in a trade, and Hawk is certainly still worth something, although I think we all know that he is never going to live up to his hype. Toss in Kuhn or Hall for good measure. Those three or four and some cash and we might be in business.
A LONG interview with him would be in order before any deals were made. His actions of the last few weeks look REALLY bad to me....