The claim of "pure Jiu-Jitsu," as HoG Drama Desk mentions, often gestures towards a lineage of instruction that traces back to early 20th-century Brazil, specifically through the Gracie family's popularization of their method of judo and its applications, a style initially learned from Mitsuyo Maeda in the 1910s. This early period of what became "Brazilian Jiu-Jitsu" was indeed less focused on the nuanced leg entanglement mechanics that developed significantly from the 1990s onward, particularly with the emergence of events like ADCC, which explicitly allowed a broader range of leg attacks.