In the end does God leave the rebel soul all alone as C.S. Lewis says?

Yes, according to C.S. Lewis and Christian Theology--"In the End"--God allows the Rebel souls to have their way. God permits the Rebel Soul to have his free will to choose what he wants for eternity and the Rebel Soul chooses something other than God.

So, "In The End" The Rebel Soul has a kind of "dark victory" in that he has Rebelled for all eternity from God.

God in His infinite goodness allows The Rebel Soul to have his way for all eternity. The Rebel Soul is allowed/permitted to have his way and God Leaves the Rebel Soul all alone for eternity.