Of Whom Does Isaiah Speak?

One of the primary questions evoked by Isaiah 52:13-55, is "who is the writer talking about?" This is a poem but as a poem, it leaves us many clues. Clearly, Isaiah is talking about David. There are over 33 commonalities at last count between the mysterious slave of the poem and David. Secondly, Isaiah also seems to be alluding to Adam. The slave is an "ish" or "man." The poem speaks of the slaves appearance" and "form," another allusion to the form or appearance of Adam created in the image of God. Moreover, Isaiah 42, another "helper poem," to Isaiah 53, speaks of "Adam" who will be given in exchange for Israel.