Horiguchi paid a visit to the backstage room reserved for Kai and his crew. Like you said, horiguchi is the elder of the 2 (or 3) with a longer pro mma career. Why was he supposed to knock on their door and have a word ? To check if his opponent's leg was ok? Horiguchi was very angry with them for not having shown any respect for him since Kai won. Mikuru even said Gucci doesn't have what it takes to win no matter how many rematches he'll be given. Horiguchi met asakura brothers to make them eat their words. Don't forget he is a killer bee fighter. Long ago, hideo tokoro made a mistake of calling out kid yamamoto in the wrong way and got his ass kicked by his boy, atsushi yamamoto. After the fight, while tokoro wasn't able to get up on feet, kid walked over to him to verbally blast him. The entire conversation was aired and kid really meant it to be aired. Horiguchi saw mikuru and said hi. Mikuru simply gave back hi. Horiguchi told the media mikuru was rude although he didn't say anything impolite. Horiguchi was merely looking for a reason to fuck with the man who consistently pissed him off during the 16 months of layoff.