These are things that I overheard.
Kelsier was not spiked.
Part of the Lord Ruler’s motivation for setting up The Final Empire was revenge against the people he viewed as encroaching on his people’s land. He was also obsessed with creating order, which Ruin later exploited.
The Ars Arcanum in the books were all written by one person.
The author of the Ars Arcanum is either Hoid or a member of the Seventeenth Shard. Brandon also pointed to an annotation on the map of Elendel that’s relevant to this question.
There’s just the one system in Warbreaker , and it’s also a world with only one Shard on it.
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