#2 It was the right conclusion to the storyline
Simply put, this is one of the best reasons why it happened. While there are better ways to go around it, what would be the point of the entire story if Shane McMahon stopped terrorizing Kevin Owens and just went after someone else?
Let's not forget that the entire point of the storyline is that Kevin Owens is the rebellious Superstar who spoke out against Shane McMahon and put his career at risk on more than one occasion, whether there was a stipulation or not.
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The premise was that Shane McMahon was a tyrant on SmackDown Live and took up TV time and all the big spots that Superstars should have been receiving. There was even a point where the locker room was divided between Owens and Shane and while their involvement wasn't that heavy after that, it only makes sense that this story concludes with the tyrant gets exiled from the kingdom.
We commend WWE for perfectly concluding the story, ending it with a really good match. Moreover, it gives Kevin Owens a huge rub, which leads us to our final point...