You know, I have been looking for a place to discuss these types of things since nobody I know seems to want to read anything I do. I recall BS saying that there are a bunch of different magic systems on Roshar. Thus far, we have not seen many. Is it possible Dalinar is slowly discovering another type of magic, similar to surgebinding but not necessarily the same thing? From an in-story standpoint, Dalinar seems revolted by killing the Parhsendi, which could be reltated to his magic, while Kaladin seems perfectly fine with what he is doing at the end. From an out-of-story standpoint, it makes more sense for your main characters to discover different things (like types of magic) than for your older, more seasoned character to have to go through the same process as your young, friggin' awesome character just did. Its kind of boring and redundant.
I could be wrong, and I'm not trying to be contrary, just throwing my thoughts in the ring.