Kobayashi made his return from injury on June 6, 2010, losing to Naomichi Marufuji in a GHC Junior Heavyweight Championship number one contender's match. On October 30, 2010, Kenta and Atsushi Aoki defeated Roderick Strong and Eddie Edwards in the finals of a tournament to win the 2010 Nippon TV Cup Junior Heavyweight Tag League. As a result, Kenta and Aoki received a shot at the GHC Junior Heavyweight Tag Team Championship, but were defeated by the champions, New Japan Pro Wrestling representatives Koji Kanemoto and Tiger Mask, on November 23, 2010. On January 29, 2011, Kenta turned heel and join the Disobey stable with members Muhammad Yone, Yoshinobu Kanemaru and Genba Hirayanagi. Kenta would change his look and attitude. Then on March 5, he turned on Yone, removing him from the group. One week later, he renamed the stable No Mercy. On May 25 Kenta and Yoshinobu Kanemaru defeated Atsushi Aoki and Kotaro Suzuki of the ANMU stable to win the vacant GHC Junior Heavyweight Tag Team Championship. After months of trying to persuade his mentor Yoshihiro Takayama to join No Mercy, on June 26 Takayama turned on his partner Takuma Sano during a tag match against Kenta and Kanemaru and became the fourth member of the group. Kenta and Kanemaru would then make it to the finals of the Junior Tag League on July 30. They lost to Atsushi Aoki and Kotaro Suzuki. Then on August 18, 2011 Kenta and Yoshihiro Takayama won the Noah 2 Day Tag Team Tournament. On August 24, Kenta and Kanemaru successfully defended their tag title against Aoki and Suzuki, who got the shot due to their victory in the Junior Tag League. On September 23, Kenta confronted GHC Heavyweight Champion Go Shiozaki after he defeated Takayama to retain the title. Kenta got a number one contender's match with Takashi Sugiura, which he won on October 10. Kenta and Kanemaru lost the GHC Junior Heavyweight tag title to Aoki and Suzuki on October 16.