The answer to the question: What is the full name of the creator of the style that is thought to be the first to descend from the one reported in a journal in 1849? is inside the article: Hachijō-daiko (八丈太鼓, trans. "Hachijō-style taiko") is a taiko tradition originating on the island of Hachijō-jima. Two styles of Hachijō-daiko emerged and have been popularized among residents: an older tradition based on a historical account, and a newer tradition influenced by mainland groups and practiced by the majority of the islanders.The Hachijō-daiko tradition was documented as early as 1849 based on a journal kept by an exile named Kakuso Kizan. He mentioned some of its unique features, such as "a taiko is suspended from a tree while women and children gathered around", and observed that a player used either side of the drum while performing. Illustrations from Kizan's journal show features of Hachijō-daiko. These illustrations also featured women performing, which is unusual as taiko performance elsewhere during this period was typically reserved for men. Teachers of the tradition have noted that the majority of its performers were women; one estimate asserts that female performers outnumbered males by three to one. The first style of Hachijō-daiko is thought to descend directly from the style reported by Kizan. This style is called Kumaoji-daiko, named after its creator Okuyama Kumaoji, a central performer of the style. Kumaoji-daiko has two players on a single drum, one of whom, called the shita-byōshi (下拍子, "lower beat"), provides the underlying beat. The other player, called the uwa-byōshi (上拍子, "upper beat"), builds on this rhythmical foundation with unique and typically improvised rhythms. While there are specific types of underlying rhythms, the accompanying player is free to express an original musical beat. Kumaoji-daiko also features an unusual positioning for taiko: the drums are sometimes suspended from ropes, and historically, sometimes drums were suspended from trees.The contemporary style of Hachijō-daiko is called shin-daiko (新太鼓, "new taiko"), which differs from Kumaoji-daiko in multiple ways.  For instance, while the lead and accompanying roles are still present, shin-daiko..., can you guess it ?
The answer to this question is:
Okuyama Kumaoji