IMO, the parallel triangle is Honor (Adolin), Cultivation (Shallan), Odium (Kaladin). Might be controversial, but Kaladin is nothing without passion, which reminds me of Vin's unique ties to ruin. Shallan is a force of creation, and Adolin's arc feels more and more like a battle to define honor for himself. In the end, cultivation is a better fit for honor, and I wouldn't be too surprised if there was actually a relationship triangle among the three shards, with honor and odium both having resided on the same planet that as cultivation at one point.