While I enjoyed Ikkyuu, let us not confuse originality with novelty. Originality implies that a series changes the rules by which a genre plays. Dragonball was original, a tipping point in manga history. In 1984 the archetypical action manga was Hokuto no Ken, violent manga featuring a hero who appeared to be on steroids. After Dr. Slump ended, Toriyama took his comedic, Tezuka inspired art style and used it for the action genre. This proved to be a game changer, altering the way action manga is presented. Twenty-seven years later Hokuto no Ken's fleshomb style art is still unfashionable while some of the most popular manga in history are clearly influenced by Toriyama.
Ikkyuu is not original. It clearly followed long established art and story tropes of the action genre. A plucky underdog sets out on an epic quest, determined to make the world a better place. In order to complete his quest he must confront and defeat enemies of escalating power, train to become strong enough to defeat them, make new friends and allies. Ikkyuu is novel in the sense that the hero relies on his wits not strength. But the concept is the same. Plot wise, this is a negligible change as it would not require any changes to Jump tropes. As enemies get stronger, Ikkyuu's wits will have to grow stronger to match. Ikkyuu would still require power ups, only to his wits not his techniques. Applying different situations to the same tropes is not original, it is novel.
Originality is not Weekly Jump's strong suit. The series that demonstrate some originality in art, writing, or execution should be considered black swans. And any originality demonstrated is quickly institutionalized, reproduced in a number of new series. Jump's primary readers are below 15 years old, a rather conservative demographic, and not necessarily interested in originality or novelty. Even compared to other shounen magazines, Jump is incredibly conservative stylistically. Anyone expecting originality from a Jump series is reading the wrong magazine. Jump is the manga equivalent of blockbuster, summer action movies. The expectations should be fast paced, slick entertainment; Oscar worthy performances are not part of the deal.