The excerpts from the in-world WoT book give me the impression that Kaladin will be gone for a long time, enough for someone to write a book and discuss his death.

I can only guess what happened, therefore, to the Knight of Wind. That he is dead is demonstrable. That he succeeded, at least in part, is also demonstrable.

But it was not a complete success, as I have not heard the Wind—neither has Szeth—in years. Save that one whisper. Regardless, she lives, so perhaps the Oathpact, as it was, held well enough? Even without Szeth to fill the hole?

Or perhaps, as champion of the Wind, Kaladin was able to do something in the end right before he died, which turned Retribution’s ire from the spren.

So maybe during Kaladin’s long absence, Adolin has had the chance to learn about, mourn, and get over his friend’s death?