Irresponsible Captain Tylor/WMG

Yamamoto is the ancestor of Ciaphas Cain
ICT is set in the Golden Age that precedes Warhammer 40,000, Ciaphas could easily be an Identical Grandson of Yamamoto. Somewhere along the line, his descendants decided the lunatic he used to serve under had the right idea and began a Blackadder style tradition of self-serving cowardice, and in doing so got granted a portion of Tylor's insane luck... but also inherited Yamamoto's misfortune.