On October 15, 2006, Katsuhiko Nakajima and Kaz Hayashi were announced as one of seven teams in the 2006 World's Strongest Tag Determination League, to take place in December 2006. They had a strong showing in the tournament, defeating such teams as NOSAWA Rongai & Triple Crown Heavyweight Champion Minoru Suzuki and RO'Z & Suwama and drawing with Taiyō Kea & TAKA Michinoku, finishing with 5 points overall. On November 14, 2006, Nakajima wrestled in the main event of the debut show of the Global Professional Wrestling Alliance, a cooperation of several different promotions, teaming with NOAH's Go Shiozaki and El Dorado's Takuya Sugawara to defeat ZERO1-MAX's Ryouji Sai, Dramatic Dream Team's HARASHIMA and Kaientai Dojo's KAZMA.