In Taln's interlude in WOR, he is undoubtedly not sane. However, some of his thoughts seem to be semi-lucid, and one particular snippet caught my eye:
Taln goes rather quickly here from insane ravings, but grammatically sound, to a sentence that makes little sense. But, it does remind me of the street dialect of Spook, that went on to be High Imperial. I'm not a timeline expert at all, so this could be something more of a common ancestor type thing, but the thought that at his weakest his mind flips to thinking to himself in this way makes me wonder if he doesn't share something with Scadrial.