Takuya Sugawara
Sakai also joined El Dorado Wrestling, where he started teaming up with Shuji Kondo's Aagan Iisou stable in an attempt to become a member. However, he had heat with Takuya Sugawara, who didn't want him in Aagan, and this brought losses and failures. At the end, Ken would lose a match to Sugawara which stipulated that he could not even occasionally team up with them, so he abandoned his aspirations and became freelance, not allied with any stable.