In my reading today of Messianism Within the Scriptural Scrolls of Isaiah, Randall Heskett summarizes the views of B. Duhm regarding the Servant Songs in Second Isaiah:
“…Duhm himself speculated that the four Servant Songs were not written by the ‘author’ of the rest of Deutero-Isaiah, but that they depicted a Rabbi who was contemporary with this prophet and died of leprosy” (page 140).
Does that mean Duhm believed that the Servant lived during the Babylonian exile, which is the setting of Second Isaiah?