[14] Oku ended up winning the 2023 RevPro Revolution Rumble, earning a match for the Undisputed British Heavyweight Championship, which he won by defeating Great-O-Khan on July 7, 2023 at Epic Encounter.

On August 24 at RevPro 12th Anniversary Show, Oku lost the Undisputed British Heavyweight Championship to Luke Jacobs, ending his reign at 412 days.

[21] Oku made his New Japan Pro-Wrestling debut at Royal Quest II on October 1, 2022, teaming with Ricky Knight Jr. defeating United Empire (Great-O-Khan and Gideon Grey).

[23] On October 14, 2023 at Royal Quest III, Oku returned to New Japan Pro-Wrestling teaming with Hiroshi Tanahashi and Strong Openweight Champion Eddie Kingston defeating United Empire members TJP, Henare, and Jeff Cobb.

[30] On June 17 at the Arena Puebla, Mistico's 20th anniversary was celebrated, he teamed up with Bad Dude Tito and Che Cabrera where they defeated Los Depredadores (Volador Jr., Magnus and Rugido).

[32] On June 19, Michael Oku, along with Amira Blair and Okumura, received the invitation from the Deputy Head of the British Embassy, Carol van der Walt, and Rachel Brazier, Chargé d'Affaires.