Huh, wouldn't The Nightwatcher's Bondsmith be able to leave Roshar, unlike The Stormfather, who's bound to the Highstorm, or the Sibling, who's necessary for Urithiru to function.
The Bondsmith that Sylphrena mentions bringing people to Roshar from Ashyn: perhaps the wielder of the Dawnshard that could "bind all creatures- mortal or Voidish"
It was mentioned by The Stormfather that the Oathpact was Ishar's work, for which he was called the Binder of Gods. Though it's surprising that he's also responsible for Heralds' immortality.
So the Surges were "bound" by a Bondsmith. The Honorblades weren't the first to harness the power... but then again, it was mentioned multiple times that Ashyn was destroyed by the Surges (Dawnshards and/or Voidbinding) but still quite an interesting statement
Welcome to the Shard! Do you remember the %? Or the... runner-up Orders?
Have you read Warbreaker yet? If you haven't, give it a try! It's connected to the Stormlight Archive. It's available for free on Brandon's website.
The original WoK had (coherent) Taln viewpoints, the most likely source of spoilers I think
And there are spoilers
Suggestion: you could wait till someone else finishes the book and then ask them which chapters you should skip to avoid spoilers
This assumes rather a lot of things about Adonalsium.
There are theories regarding other Shards helping Odium in Shattering Honor. I would say they are quite plausible.
That being said, a greater system, one which could bind even Shards is an interesting prospect