Most racedays with other riders
Riders sorted by the number of times they started in the same race as Shinsuke Kozai.
| # | Rider | Number of races |
|---|---|---|
| 1 | SANO Junya | 10 |
| 2 | OTSUKA Wataru | 9 |
| 3 | ISHIBASHI Manabu | 9 |
| 4 | OBATA Kaoru | 9 |
| 5 | TSUBAKI Hiroshi | 8 |
| 6 | SAITA Naoto | 8 |
| 7 | ABE Takayuki | 8 |
| 8 | SUZUKI Yuzuru | 8 |
| 9 | OKA Atsushi | 8 |
| 10 | KUBOKI Kazushige | 7 |
| 11 | NISHIZONO Ryota | 7 |
| 12 | NAKAMURA Ryutaro | 7 |
| 13 | KOMURO Masanari | 7 |
| 14 | YAMAMOTO Genki | 7 |
| 15 | TAKAOKA Akihiro | 7 |
| 16 | DOI Yukihiro | 6 |
| 17 | KATO Tatsuya | 6 |
| 18 | KIMURA Keisuke | 6 |
| 19 | HARADA Hiroaki | 6 |
| 20 | KOMORI Ryohei | 6 |
| 21 | IWASHIMA Keita | 6 |
| 22 | KOISHI Yuma | 6 |
| 23 | SATO Shinya | 6 |
| 24 | TAKEDA Yoshinori | 6 |
| 25 | TAKEI Kyosuke | 6 |
| 26 | MASUDA Nariyuki | 6 |
| 27 | ONODERA Rei | 5 |
| 28 | HASHIMOTO Eiya | 5 |
| 29 | UCHINO Naoya | 5 |
| 30 | AYABE Takeaki | 5 |
| 31 | TAKAGI Michinari | 5 |
| 32 | WATANABE Satoru | 5 |
| 33 | SHINMURA Minori | 5 |
| 34 | MINATO Ryo | 5 |
| 35 | FUJITA Kozo | 5 |
| 36 | TOYODA Katsunori | 5 |
| 37 | YOSHIOKA Naoya | 5 |
| 38 | WADAYAMA Takafumi | 5 |
| 39 | NONAKA Ryoma | 5 |
| 40 | YOSHIDA Hayato | 5 |
| 41 | DAITO Yasuhiro | 5 |
| 42 | IRIBE Shotaro | 5 |
| 43 | KANO Tomoya | 4 |
| 44 | KITANO Yukinori | 4 |
| 45 | HATANAKA Yusuke | 4 |
| 46 | KAZAMA Hiroyuki | 4 |
| 47 | YAMAKURA Mikitake | 4 |
| 48 | SATO Hidekazu | 4 |
| 49 | HIRATSUKA Yoshimitsu | 4 |
| 50 | UCHIMA Kohei | 4 |