If you didn’t see the Zane/Kelsier comparison later, I bring it up here. In a way, Zane’s purpose in this book is to represent things that Vin never really had an opportunity to choose.
She ended up with Elend. However, there is another option, and that was the option that Kelsier represented. The option that Zane represents. Despite her assurances to Elend that she didn’t love Kelsier, there WAS something there. Kelsier had a magnetism about him, and since he died, Vin didn’t ever have to choose between him and Elend.
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