#4 Vince has had enough of Kurt Angle
After WrestleMania 20, Angle suffered from a neck injury and was made the General Manager of SmackDown. As a heel authority figure, Angle made sure to make things hard for the likes of John Cena and Eddie Guerrero. Angle went on to cost Guerrero the WWE title at The Great American Bash 2004, resulting in JBL winning the title for the first time in his career.
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When Vince McMahon learned that Angle was faking his handicap status all this time, he was livid. The boss confronted Angle on an episode of SmackDown and fired him from his position as the General Manager of the blue brand. This decision had been a long time coming, as fans weren't thrilled one bit with Angle taking liberties with his position and costing the beloved champion Eddie Guerrero his WWE title.