I think that SK wanted us to compare and contrast God and Gan: Unless you believe that none of the horrors of the multiverse in his novels are any worse than the horrors of the real world, it would seem that his fictional Creator is not equal.

IMHO, razz, Walter is indeed wrong about the top of the Tower being empty, and I do think that Gan is good... but I'm not absolutely sure, by any means. It is a good question, and a tough one to answer on the sole basis of King's novels.