3. Jimmy Butler
Jimmy Butler was a hell of a find by the Bulls' front office in the 2011 NBA Draft. The Bulls selected him with the last pick of the first round, as he largely went under the radar.
Butler projected to be a 3-and-D player, which was perfect for then-Bulls coach Tom Thibodeau. This proved to be true in due time, as Butler became one of the league's better wing defenders by his second season, while also shooting 38 percent from deep.
Butler was named to the All-Defensive team in his third season and became a starter for the Bulls, who won 48 games and were essentially without Derrick Rose for the entire season. By year four, Butler was a legitimate All-Star and seemed capable of being a future franchise cornerstone, as he made four straight All-Stars and two All-NBA teams.
This was a welcome sight, as Derrick Rose, Luol Deng, and Joakim Noah had all reached the end of their collective primes. However, Butler became a nuisance for the Bulls, as he butted heads with teammates (which he also did in other stops around the league after Chicago).
Then there was the clashing with his coach, Fred Hoiberg, who hoped to rely on him as a leader and 26-year-old superstar, due to the aforementioned dismantling of the prior core. Butler ultimately requested a trade, as he didn't want to be a part of a rebuild and was tired of losing.
In other words, he quit on his team. Which landed him a trade to the Minnesota Timberwolves, re-uniting him with the Bulls former coach Tom Thibodeau.