What ever happened to the stone Gavilar gave to Szeth? He could have been setting himself up to be Odiums unknowing champion. With that in mind, I like the idea of Elhokar being setup for that.
He's got this hole self brooding mentality and paranoid fear that his Uncle is setting himself up to be King. Now that Dalinar is the impromptu Radiant leader as a Bondsmith, we probably will see Elhokar's paranoia take a hold of him even more. He'll strive for that power to confirm himself as the actual king, which maybe that black stone is Odium's way of making his own "radiant." At that point in time, we have Odium's champion being the King, which will be a huge hit against Dalinar as his love for his nephew is great.
But, this is all too predictable so probably won't happen.
All just a tangent.