Wrestle Kingdom 9
On August 10, 2014, NJPW made two announcements. Firstly, Wrestle Kingdom 9 would be held at the Tokyo Dome on January 4, 2015. Secondly, NJPW revealed a partnership with Jeff Jarrett's Global Force Wrestling, which it approached about bringing the event to a new market. On November 4, GFW announced that it would present the event live on American pay-per-view television and that it had a PPV market of 125 million homes.
Wrestle Kingdom 8
Tetsuya Naito used the snub he suffered at Wrestle Kingdom 8 to turn heel and form the "Los Ingobernables de Japon" stable. When he finally won the IWGP Heavyweight Championship from Okada in April 2016 at Invasion Attack, Naito had managed to turn his career around and was now fully embraced by the NJPW fans. There was another rematch between the two at Wrestle Kingdom 12 on January 4, 2018, with the same result as Okada retained against Naito.