As I saw a lot of different ideas being thrown around concerning Jasnah interviewing Ash, I thought we should open up a seperate thread for it.
So here are my initial thoughts:
I think it's very cool that Jasnah actually spoke to Ash (and possibly Taln, depending on his mental state) to gain information about the previous Desolations and the enemy. There surely are some interesting bits of information to be uncovered. However, I think it is noteworthy that Kaladin does not know about the (presumed) Transportation-Fused. He infers the Fuseds surge based on his observations, not on anything he's been told by Jasnah or Ash. Furthermore, he speaks about Dalinar claiming that there are only nine types of Fused- not knowing - but wouldn't something like this be basic information for the Heralds to share? The easiest answer might simply be that Kaladin doesn't know about everything Ash has shared, but that seems unlikely (with him being a high-ranking Radiant and trusted ally to Dalinar). What might be the case is that, after Jezriens death, Ash is know zoning in and out of awareness, similar to Taln.
I'm very interested to read your speculations on this topic and everything else concerning the Heralds!