The whole Ruth/Naomi baloney was more of the schism of 1918 onward Rutherford excuses for divisions. They were looking for parallels everywhere, downright fixated they were! So, the Ruth class isn't everyone after 1918, just those in the 1920's willing to follow the Judge. This crap isn't published after 1980, you just dont see it anymore.
*** w80 2/15 p. 16 Festival Illumination ***
In the period from 1919 onward thousands of others took their stand for God’s established kingdom and dedicated themselves to Jehovah, got baptized, were begotten spiritually and were anointed with God’s spirit, and these were added to the ranks of the original remnant. These newly added ones were, as a class, prefigured by outstanding characters in pre-Christian Bible dramas. These illustrious characters were Ruth the Moabitess, who became the loyal companion of the Jewess Naomi, her mother-in-law, and also Queen Esther, the cousin of the Jew Mordecai, who became the prime minister of the Persian Empire under Emperor Ahasuerus, or Xerxes.
*** w80 2/15 p. 21 Festival to Be Celebrated by Billions ***
However, the ingathering of those of the "great crowd" did not stop the gathering of any further members of the Ruth and Esther class. No, but more "branches" worthy of becoming part of the Christ "vine" kept on being gathered. (John 15:1-8) More "branches" continued to be gathered for being "grafted" into the symbolic "garden olive tree," as described in Romans 11:17-24.—Deut. 16:13.
*** w52 4/15 p. 252 Aids for Understanding Prophecy ***
In the complete fulfillment the first installment occurred in the spring of 1919, when the spirit was poured out to set to work the anointed Christian remnant who survived the temple judgment of 1918. Then three and one-half years later, in the fall of 1922, the Ruth and Esther class of the anointed remnant began to come in and were set to work. These 1919 and 1922 events are in direct parallel to the events of A.D. 33 and 36.