We need to weed out some of the guys who will never produce and trade them for another solid piece (Shattenkirk etc...).
So... Garbage Out/Talent In.
Yeah... No. Not gonna happen.
St. Louis, for example, isn't going to take our middling/marginal/third pairing/bottom 6 talent and give us Shattenkirk.
It just doesn't work that way.