Oh so this coach was probably also behind the unbeaten squad with Nagaoka, Kotoe Inoue, Kawaii, Iwasaka, Akutegawa, Kodaira, Minemura etc who won the 2008 U19 Asia Championship and didnot drop a single set along the way. They destroyed the young China team with Ding Xia, Yang Jun Jing, Liu Xiao Tong, Zeng Chunlei etc at the final. But i highly doubt they can repeat this feat if these 2 squads ever meet again.
Ha! I just looked it up and indeed he was: 2008 Asian Junior Championships (Japanese Wiki). He also coached some of that group (without Nagaoka, Iwasaka, Inoue, etc.) the previous year at the 2007 World Youth Championship but they didn't do so well.
From his J-Wiki Profile it appears those were the only two times he's coached a National Squad prior to this year's U20. Those were Golden Years. As Coach of Higashi Kyushu Ryukoku he won five straight Gold Medals in the All Japan HS Championships - 2008 through 2012.
I have a feeling he might be better with kids than steely veterans. Not sure what Yuki Ishii or Risa would think of his airplane impersonation He may not be in line, or interested, in taking over the Senior NT. Time will tell.
With this U20 Squad, he either got lucky this group of kids came along (four of the starters are from the HS team that beat him last HS Championship), or he's brilliant. Or both. He picked that squad and stuck with them. When Nishikawa was clearly struggling at the beginning of the Gold Medal Match he took her out, but put her back in for Set 3 to finish the match. That was the decider.
I think if, say, Kumi Nakada were coaching this squad she would have played Nakagawa over Soga. I like Nakagawa but that would have spelled doom. Soga was so important in lifting the team