#3 Giving Creative control to top stars
One of the biggest problems WCW had was that the promotion gave guaranteed Creative control to some of the top Superstars at the time. Hulk Hogan had booking power, and something like this was destined to fail at some point in time. Although the nWo's popularity saved WCW from Hogan consistently hogging main event spots, this didn't last long and WWE soon managed to get the upper hand on its rival.
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At the peak of Goldberg's streak, he held an incredibly impressive record of 173-0. Kevin Nash, reportedly taking advantage of his booking power, booked himself to become the wrestler to break Goldberg's undefeated streak that had originally turned him into one of the biggest Superstars of the Attitude Era. Giving Creative control to the old guns is bound to hurt a company in a big manner, and AEW should make it a point to never let major stars get too much of booking power.