Baron (1983) considers the evidence to be convincing when a correspondence between /ɾ~l/ and /n/ (from *ɾ) is established: * Compare Biaka -ɾo, -mo, -na.

Usher further classifies Yale (Nagatman) with Guriaso, and adds Busa, all under the name "Senu River".

[1] There has been confusion over the membership of the Kwomtari family, apparently due to a misalignment in the publication (Loving & Bass 1964) of the data used for the initial classification.

However, Baron sees no evidence that the similarities are due to relationship.

Usher likewise discounts the inclusion of the Fas languages.