They could not determine Umunosuke YUKI being registered in any historical documents at that time, nor on the list of names of when the Shinsengumi became the direct servant for the bakufu (Japanese feudal government headed by a shogun) under the name of the Mimawarigumi on June 10, 1867, a record from December 12 of the same year in "Doshi Renmeiki" (written by Shinpachi NAGAKURA), the list of members created by Toshizo HIJIKATA on January 20, 1868, or "Senyu Esugata" (Painting about my fellow soldiers) painted by Nobori NAKAJIMA after the Battle of Hakodate.
同時代資料としては、慶応3年6月10日に新選組が見廻組として幕府直参となった際の名簿や、同年12月12日付『同志連名記』（永倉新八）、慶応4年1月20日に土方歳三が作成した人員名簿、果ては函館戦争後に中島登によって描かれた『戦友絵姿』などにも、結城有無之助の在籍を確認出来ない。