In September 2005, Akihiro took part in the PRIDE Welterweight Grand Prix. He became controversial for criticizing Ryo Chonan and Masanori Suda's performances and right to fight in the tournament, somewhat they called off on him back. At the first round, Gono won an upset over Daniel Acacio, showing one more time his ability to avoid damage in stand-up and counterattack. The same night, at the second round, he faced Dan Henderson, suffering an accidental headbutt before losing the match by KO.