#6 Kevin Nash

Kevin Nash in the main event of WrestleMania was indeed the plan at one point, 1995 to be exact.
Yes, back when he was Diesel, he was one of WWE's biggest and best Superstars and was having WWE's hottest feud at the time, with former tag team partner Shawn Michaels.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
As WWE was entering bad business in 1995, they would try to seek as much publicity and media as possible, and decided to promote the celebrity match, NFL star Lawrence Taylor vs. Bam Bam Bigelow, as the main event.
This was a real shame. Not only should Diesel and Shawn been the main event at the time, based on that it was WWE's best feud and for the WWE Championship, but it also turned out to be the best match of the card, that year and probably the best in the career of Kevin Nash.