https://www.jwfacts.com/watchtower/1925.php Why the Jonadab explanation: By 1925 (the then predicted date of the end) 90,434 attended the memorial (all Bible students then (late changed to Jehovah's witnesses by Rutherford in 1931) so all were self-professed "anointed." Fast approaching 144,000. So the WTS had to come with an explanation for that. First, how many anointed were there in the 1st century, were there any between 100 CE to 1874 CE? Especially when the "end" did not come in 1925 as WTS predicted. The attendance dropped considerably after that as the following graph shows.
Preaching that the earthly resurrection would commence in 1925 resulted in tremendous growth for the Watchtower Society.
"This resulted in bringing into the sanctuary many more to be members of this remnant consecrated by Jehovah. This was evident from the increasing attendance at the annual celebrations of the Lord's evening meal,
32,661 participating in 1922;
42,000 in 1923;
62,696 in 1924; and
90,434 in 1925. ...
89,278 [in 1926]"
Watchtower 1960 May 1 p.282