Yeah that was recorded in 2014.
Stun Gun was indeed ranked top10, around the time he fought Woodley.
You can see him looking to set up those kinda wild swings in the standup he knocked Erick Silva and John Hathaway with, a style that he worked on specially after Yushin Okami got cut because, according to Kim, he realized he would be in danger of losing his job too in case he didnt took a less risk-averse style of fighting.
According to Dan the Wolfman, he didnt see Okami losing a single round to anybody in that room btw.
Akiyama is indeed pretty sharp and looks undersized. His main shortcomings imo were a limited ground game to take advantage of his great TDs and also lack of endurance.
Here he is trowing the way heavier Dan the Wolfman around with beautiful trips.
The other fat guy in the room is Ken Hasegawa, at the time Pancrase HW champion who had an epic war with Aung La in ONE.
There is also a very tall guy who was a pro kickboxer from the Middle East I can't remember the name now.
Dan the Wolfman seems a bit of a weirdo but you obviously need to have some skills for those guys to allow you spar with them in a regular basis