Just read this Prologue. Wow! I definitely have to reread all the books in the series.
By now it is clear that honorblade is not the same as shardblade, more like Soulcasters. And the Taln sheet is not the same, as at the beginning, and the author confirmed this.
Regarding the Stormfather, I have a feeling that there are two interspersed characters who interact with Gavilar. With Dalinar the Stormfather talks without desire or interest, only giving the Honor's videomessage.The other is more than alive and very interested in acting. It can't be the same thing or whoever.