How are the Luish languages related to Kachin?

Within the Tibeto-Burman language family, the Luish languages—which include Kadu, Andro, Sengmai, Sak, and possibly Chairel—are considered to have a close, though sometimes obscure, relationship with Kachin (Jingpo).12

Modern linguistic classification, specifically the schema used in the Sino-Tibetan Etymological Dictionary and Thesaurus project, formally groups these languages together into the Jingpo-Nungish-Luish subgroup. While the Luish languages are noted for their resemblance to Kachin, they are distinct from the Burmish languages (such as Atsi, Lashi, and Maru) that are also sometimes loosely referred to by the name Kachin.132