@Adamkarma
Okay, I think I see what you mean. Part of it might be Dalinar's connection to the Stormfather (him becoming a Fused might transform the Stormfather into the equivalent of a dead-eye), part might be that Dalinar is able to make the deal where he is at stake but he can't do it for anyone else, and part might be that the Heralds souls couldn't be bound involuntarily as Fused because of the connection to Honor. Plus Kal is a very honorable person so Odium might not even want him. I would think he wants Kal, but he might not. Also, if you've read the Rhythm of War, somewhere in it