I started going through the Arse Arcanum in the back of WoR, and looking at the personality traits for the 10 essences and matching them up to the confirmed KR's.
Kaladin is Protecting and Leading; Shallan is creative ans honest; Jassnah Is Wise and Careful ; Szeth is Just and Confident (at least their character arcs are molding them into such, but they already held more than a glimmer of that BEFORE they bonded with their Spren.)
The 3 we haven't seen yet confirmed are Dustbringer (
I like this theory. Elhokar is an interesting character for me, because I personally am really invested in what will happen to him, but at the same time no theories I have come across or thought of have really felt satisfying. This is one I can get behind.
Its logical, but also defies audience expectation. Good work! I'm not sure how exactly it would be implemented, but its what I think I will be rooting for.