Yet another QQC.

"Without Gorilla, will there be hope for man?"

Why was that on the back of the poster? What does it mean?

I think it means that, since the narrorator no longer has a teacher, I think Ishmael has hopes for the narrorator and that his job was done. His whole theory was that, if you want to change the world, you need to rewrite what was written by history.