The boy from the corner repents becoming the coroner
Just end it, so deep it may never be reached
Besides being uninterested in writing a 16th bar, DL also chooses to not explain the depth of his statement, taking the depth figure of speech so far as to compare it to distance in its reachability. Thankfully for whoever is reading this, the author is more than willing to explain.
The boy formerly from the corner, no longer in it, has become a coroner, and regrets it very much. He is a coroner because he knows about the dead, skeletons (from closets) before any others, like a coroner would pronounce a person dead. He had hoped that filling this role would bring him happiness, but he was wrong.
Also, he regrets this because as a shadow, he cannot interact with others. He now realizes that he was not entirely uncared for, and the boy from the spotlight could have been his friend. But alas, that is no longer possible.
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