The Kings are looking to make changes, and unloading Cousins and Gay would represent a massive shift for a team that grossly underperformed in 2015-16. As talented as those two players are, they were both allegedly part of the team's troubles last year, so moving them and starting fresh would seem to be a viable option for Sacramento.
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The Bulls thought they might be in a rebuilding phase after Derrick Rose and Joakim Noah were subtracted from the roster this summer, but then the team added Rajon Rondo and Dwyane Wade to their backcourt. In an instant, it appeared that Chicago was close to being a contender if they could make one more deal, as detailed by Forbes. The Bulls are now a buyer in the trade market since they should be able to make some noise in the Eastern Conference race in 2016-17.
There is a feeling among those around the league that Rondo, Wade, and Butler may not be an ideal threesome to lead the Bulls, and if the right deal comes along one of them could be dealt. Jimmy Butler is the only one of these players who is currently trade-eligible (per NBA rules), and he is arguably the most valuable of the three, as well.