It seems Kozuka retired.
After being 5th in Japan Nationals, he was not assigned to 4 continent or world this year.
http://headlines.yahoo.co.jp/hl?a=20160315-00000073-sph-spo
After being 5th in Japan Nationals, he was not assigned to 4 continent or world this year.
http://headlines.yahoo.co.jp/hl?a=20160315-00000073-sph-spo