Kusi is listed as the second major subgroup of Mashariki. Its classification includes four components: Nyasa, Makua, Shona, and Southeast-Bantu. Each is associated with a set of linguistic zones, indicating a distribution in southeastern Africa.

The Nyasa subgroup includes zones N.20–40, except for N.41, which is assigned to Sabi. Makua is placed in P.30, Shona in S.10, and Southeast-Bantu in S.20–60 together with K.21. These distinctions define Kusi through the geographical organization of the linguistic classification.

The excerpt gives no separate historical chronology for Kusi or its four subgroups. Its significance here lies in its position within the Mashariki classification and in the regional distribution encoded by the cited linguistic zones.