Who do you think received the worst push after winning the WWE's King Of The Ring Tournament? I believe it was hands-down Wade Barrett in 2015. If anything, he started losing MORE after he won the K.O.T.R. Tourney.
I'd agree. He lost a bunch leading up to it, with the justification seemingly being “He's going to win the KOTR and get a big push from it, so it's OK” and then he lost more after it, with the justification seeming to be “Well, he won the tournament, so he can afford some losses”. And then that was it for him. Poor bastard never recovered from losing that Bad News gimmick due to accidentally getting over.