On April 20 Zeus and Bodyguard were defeated in their last match with Quiet Storm against Billyken Kid, Bull Armor Takuya and Black Buffalo.

On March 28 Zeus and The Bodyguard made their debut in All Japan Pro Wrestling (AJPW) by defeating Menso re-Oyaji and Sushi.

On May 16 Zeus and The Bodyguard had an opportunity for the World Tag Team Championship but they lost to the defending champions Evolution (Joe Doering and Suwama.

The Big Guns participated at the 2015 World's Strongest Tag Determination League and were defeated by Kento Miyahara and Suwama at the finals of the tournament.

On December 23 they won the World Tag Team Champions by defeating Wild Burning (Jun Akiyama and Takao Omori).

The Big Guns returned to Osaka Pro for one night only on May 1, 2019, for the promotion's 20th anniversary and teamed with Mondai Ryu to defeat Hide Kubota, Kushikatsu Oyaji and TAMURA in a six-man match.