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I totally agree with you. This is a perfect explanation.
And King put our world *the real one we live in*, put us into the story, with putting himself. He made real world fictional, and fiction more...

If it is his egoism that made King to put himself into the story, I would wish his ego to grow more.
Creation is the greatest egoist.

It was like a present to me, never thought it is weird. King's including himself in the Dark Tower story, made it deeper;
and I think the loop became more meaningful.
And it represents how strong...