This thread gave me an interesting idea as well. What if Evi never passed on...
(Mistborn spoiler:)
Maybe even she knew something the whole time, possibly due to her connection with cultivation (she was the one who kept encouraging Dalinar to visit the nightmother). In the flashbacks we see her constantly trying to help Dalinar be a better person and escape the thrill and war, and not too mention she agreed to the marriage/alliance to begin with even though she knew they had such conflicting beliefs. Maybe she had some inkling of his future importance, and even when killed, she hung around to watch him and help him in his most dire moment.
Obviously wild speculation is wild
(Mistborn spoiler:)
But it could still be fun. It would fit with Brandon's interest in behind the scenes work and side events or characters actually being more important than realized.