Of the nine scholars, four dealt with the origin and meaning of words: Ōtsuki Fumihiko, Shinmura Izuru, Kanazawa Shōzaburō, and Orikuchi Shinobu. All four asked, “Where did this word come from?” But the way they checked differs. (Overall timeline)

Four ways of checking

ScholarMain workHow they checkedRepresentative words
Ōtsuki FumihikoGenkai (1889–1891)As a dictionary, explaining by combining pronunciation, part of speech, and definitionThe dictionary as a whole
Shinmura IzuruNihon no kotoba (1940)Lining up documentary evidence and limiting what is claimedtotemo, right and left, kiseru, baka
Kanazawa ShōzaburōKokugo no kenkyū (1910)Comparing with other languages: Korean, Ainu, Ryukyuan dialects, Sanskrittachi, kumoru, namida, east-west-south-north
Orikuchi Shinobu“Kokugo to minzokugaku” (1937), “Gokon-ron no danpen” (1931)Reading words by clues from the life and beliefs of the ancientsitoshi, haikara, sake→saka, kotodama

The fate of each answer

Lining up the verdict articles shows that the answers’ fates are scattered.

What survived

What was rewritten or rejected

What is unsettled

What was not proved

Survived Dictionary model (Ōtsuki) / kiseru = khsier (Shinmura) / itoshi (Orikuchi) / name of thing ⇄ action word (Kanazawa) Those whose evidence and range of claim were clear Rewritten Individual definitions/etymologies (Ōtsuki) / the Zhao Gao story for baka is a folk etymology (Shinmura) Those that reflected the knowledge of their time, or folk etymology Unsettled Right and left (Shinmura) / na = eye; east-west migration theory (Kanazawa) / word order, fuyu (Orikuchi) Many are ones the scholar himself called "incomplete" or "conjecture" Unproved Ear-eye-nose-mouth vs. Korean; the Japanese–Korean kinship theory (Kanazawa) Regular sound correspondences were not shown. Also used in the political arena Diagram: ToL (after each verdict article; a generally known summary, not an item-by-item check of papers)
The four fates of etymological answers. Diagram: ToL

What divided the fates?

Reading through the verdict articles, three things seem to have divided the fates. But this is a tendency ToL read from the features’ accounts, not an assertion.

One is the kind of evidence and the range of claim. Shinmura lined up documentary evidence and did not claim what he could not claim. His reservation on “right and left” is regarded, looking back, as accurate.

Two is whether regularity is shown. Kanazawa’s correspondences with Korean lined up similar sounds and showed no regular sound correspondences. This is a point we confirmed repeatedly in the Kanazawa feature.

Three is whether the scholar himself marked the limits of his conjecture. Orikuchi marked the limits of his conjectures, and Kanazawa too said the east-west migration theory was “still incomplete.” Those marked as such are easily read, in later times, as hypotheses as they stand.

What to keep in mind when reading

First, we have not individually checked whether these etymological “answers” are right, in this group of features. The “present treatment” is the generally known summary of each verdict article. How each is treated now in individual papers, we have not checked.

Second, the word thread includes something of a different nature: Ōtsuki’s dictionary. A dictionary is not a book stating etymological theories but a tool describing how words are used. It cannot be measured with the same yardstick as the other three.

Summary

PointDetail
Four ways of checkingDictionary (Ōtsuki) / documentary evidence (Shinmura) / comparison with other languages (Kanazawa) / life and belief (Orikuchi)
FatesSurvived / rewritten / unsettled / unproved
What seems to divide themEvidence and range of claim; regularity; marking the limits of one’s own conjecture
CautionThe correctness of etymologies is not individually checked. A dictionary is of a different nature

In a nutshell — In the word thread, the same question of “etymology” had four ways of checking — dictionary, documents, comparison, life and belief — and the kind of evidence and the range of claim seem to have divided the fates of the answers.