You give {su'o pa mei} to all referents of a universe of discourse,while I give {su'o pa mei} to certain members of it, not to all.
It is for the purpose of giving expressions with {N mei} and {lo N broda} to non-individual referents.Even if speakers regard {lo nanba} as non-individual, they may want to use {N mei} to a particular referent of {lo nanba}, because the expressions of {N mei} and {lo N nanba} are useful for giving a mapping from an order of quantity into transitivity of {me}. These expressions facilitate comparison of quantity between {ko'a me lo nanba} and {ko'e me lo nanba} without using other unit than what is defined by speakers.
Using {ke'a}, our definitions are described as follows:(D1-7) ko'a su'o pa mei(D1) ke'a su'o N mei := su'oi da poi me ke'a ku'o su'oi de poi me ke'a zo'u ge da su'o N-1 mei gi de na me da(D2) ke'a N mei := ke'a su'o N mei gi'e nai su'o N+1 mei(D3) lo PA broda := zo'e noi ke'a PA mei gi'e brodaWhen (D1-7) defines for {ko'a}, the referent of {ko'a} satisfies {su'o pa mei} _non-distributively_.Any other referents that are {me ko'a} do not satisfy {su'o pa mei}.
As for (D1-7), speakers who talk about non-individual referents may select not only {ko'a} but also any arbitrary {ko'e} {ko'i}... as {su'o pa mei} as long as the selected referents don't conflict each other.
(D1-7) is only a sample for discussion. Speakers arbitrarily select referents to be {su'o pa mei}, not only {ko'a}.In other words, (D1-7) gives a subjective unit to non-individual referents. If you don't call it definition, you may exclude it from a set of definitions on {N mei}. In any case, the meaning of {su'o pa mei} is entrusted to speakers, and it is not necessarily {ro'oi da su'o pa mei}.Defining {su'o pa mei} involves giving a unit to a set of referents that are related with transitivity of {me}. I want to let speakers have the right to define a unit.