Shard of Frustration

So the first problem I see with this theory is that Kalak says in one of the chapter epigraphs something about not being able to remember, essentially because he's existed for so long that new memories are overwriting old ones because his mind is out of storage space, so I don't think erasing memories will "fix" anything. Removing the random fragments of partially overwritten memories might make them more coherent immediately, but any further growth would involve them living for (months/years/decades) and forming new memories and bonds. As for Taln, he 100% absolutely would not do that. If he was even mildly annoyed by being "abandoned" on Braise, he had to option to return at any second. He could change his mind at any point with a thought, possibly even an errant thought, and be back on Roshar.

Sunlit and Tress tie for first, Frugal gets third, and Yumi gets a distant 4th