Jerry, attractive character that he was, found extra work in advertising. The header indicates that Givney was, indeed, back in the strip by '23. Wither Fisby? Who knows.
Doesn't seem to be enough to knock someone over. Seems the logical result of his exhortations, but there it is.
You might wonder: is there anything else to say about Jerry after all these years? Has anyone else found anything of note?