Leshwi said that the spren finally forgave them once one bonded Venli. There's still a lot we don't know about the beginning of the war. I think we were previously told that singers sided with Odium after the spren chose the humans. I wonder why the spren felt betrayed by the singers.
I didn't catch much more on the whole Dalinar/Unity thing. It was great to see him connect Kaladin to Tien in the spiritual realm. It was interesting that Kaladin's fourth ideal was not accepted by the Stormfather, but by someone else who sounded familiar. Unity? Tanavast? There must be something to the Stormfather referring to Kaladin as Child of Tanavast when he refers to others as Children of Honor instead.