So I was WoB hunting on Theoryland, and came upon this very nice one about Honourblades and Hoid:
Now, we know that the Shardblades come from Spren, but also that the Spren that are Splinters of Honour copied the Heralds to make the KR. This means that there were the Spren before the Spren...
We also know (but I can't find the WoB) that there were Adonalsium Spren left over on Roshar. (If anyone puts it up on here, I'll add it.) My theory is that Honour used them to make the Honourblades.
Also, the fact that Hoid makes the distinction with this makes it important and quite resolute. Anyway, pretty straightforward. Thoughts?