User blog comment:Blackendedsoul/Why not Shiki?/@comment-1440995-20120506034524

Simple, he was powerfull, but Roger had influence, by spreading the idea of "adventurous explorer" pirate, he was considered the inspiration to anyone to enter piracy, killing him was SUPPOSED to crush th come-to-be pirates inspiration and put'em in their places again (well, it failed, since Roger spit the beans of his treasure...) while Shiki wasnt a model to anyone, he was considered a simple lv 6 prisioner, arresting him wouldnt have any aftereffect like Ace.