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Mr. Kennedy was supposed to be Vince's illegitimate son, then he got himself a Wellness Policy violation. This was going to be the original angle for the "Who Killed Vince McMahon?" angle.
Apparently, the night Chris Benoit died, the "murderer" was supposed to be revealed as Linda McMahon, who would be arrested at that show. Some weeks after the funeral, which would have included Vince's real-life older brother Roderick McMahon III and his kids, there was supposed to be an "aired will reading" by Mr. McMahon himself wherein he would leave the entire WWE in the hands of his "illegitimate son" Mr. Kennedy. This was meant to turn Kennedy into a massive heel and give him a mega-push to the championship. At that point, Stephanie McMahon and Triple H were going to reveal their kayfabe-second, consensual marriage - based on their real one - that would entitle Triple H to combat Mr. Kennedy for the right to own the WWE, culminating in a feud that would push all the way to the main event of that year's WrestleMania.
After THAT was finished, in which Triple H would win back control of the company from Kennedy, Vince was meant to come back and reveal that he'd faked the whole thing and setup Linda to take the fall so that way he could give everything to his "true son."