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So I was listening to the Shardcast about the love triangle between Shallan, Kaladin and Adolin, and someone pointed this out. At this point in Oathbringer, on page 1201, Kaladin is talking about Shallan and the fact that "she reminds me of someone." While we aren't given a direct answer as to who that someone is, the next page starts off with Syl saying "That's a nice rock" and Kaladin saying something nerdy and specific about that rock. Who did Kaladin care about who loved rocks? Tien.