The following classification is based on their proposal, with the addition of the Pyu and language, added by Laycock (1975): Laycock (1973; 1975) grouped the languages differently, placing Kwomtari and Fas together in the "Kwomtari family", and Baibai and Nai (Biaka) together in a "Baibai family", and calling the overall grouping "Kwomtari–Baibai".
Laycock also added the Pyu isolate, though he admitted, "A great deal more work is required on the Kwomtari Phylum before the classification can be regarded as established" (1973:43), and he published no evidence.
However, Baron (1983) notes that Laycock's reclassification appears to have been due to an alignment error in the published comparative data of Loving & Bass.
Baron added a newly discovered language, Guriaso, as a divergent branch of the Kwomtari family proper, and noted that as of that date Laycock maintained the inclusion of Pyu.
Possible Pyu–Kwomtari pronominal cognates listed by Foley (2018) are:[1] Pronouns in Momu (Fas) and Kwomtari:[1] Unlike in many other Papuan languages, nouns in Kwomtari and Fas languages do not have gender, noun classes, or number marking.