#2 To legitimize Kevin Owens' face turn
Fans always knew that Kevin Owens had potential as a babyface, but the fact of the matter is that he was such a well-established and well-tested and proven heel that it was hard to imagine him in any other role.
Even when WWE had him return as a face, they scrapped those plans rather quick. Owens was very open in an interview about the fact that he wanted to try a face turn and he got what he wanted, furthering the comparisons to 'Stone Cold' Steve Austin.
WWE probably thought of multiple ways to help him capitalise on his newly found momentum and likely felt as though the best way to do so would be to give him a quick and effective win.
Given how the match went about and the promo that was cut afterwards, it's safe to say that Owens has only gained more momentum.