Nope, you didn’t miss anything!
The first stories for Brothers Apart was written quite a bit before the other stories were ever conceived of. In the beginning, the story shadowed the Supernatural storyline a lot closer, before the story really took off in its own direction.
Sam used to have the same ability from the TV show, where he got prophetic dreams. I ended up switching tracks around the time that Taken was being written, and decided to give my borrowers their own special abilities instead of paralleling the special children from season 2.
If I remember right, you will see bits and pieces of Sam’s knack start to appear in Taken, and then it shows up fully in Adventures at Bobby’s. We started writing A Lich of Sense right after Taken, and after that all the rest of the AUs took off and Sam’s knack became official, with Dean’s shortly following.
A lot of the ideas for the knacks owe a huge thanks to my cowriters! They wouldn’t be anywhere near as developed without them, and @neonthebright is the one that came up with Dean’s knack!
These days we love brainstorming on who would have what knack if they grew up a borrower!

