Paraphrased from memory.
In general Q&A: can Investiture be used to go faster than the speed of light? Yes, in many different ways, some much easier than others.
My questions
During the events of Stormlight Archive, is Yolen still populated? Yes... yes, I would say so since a letter is written to somebody on Yolen.
Was Leras bonded to a being in the Cognitive Realm? You mean like a Nahel bond? Yes, or a similar mechanism. Well, you have to remember that Shards interact with the realms in a different way, so... Well, I more mean before Leras became a Vessel. Anything before then is RAFO. (and I got a card)
You've mentioned before that Hoid ends up where he needs to be. Yes, and usually without knowing why. Is Chromium involved in that? Yes. Well, he's not necessarily using Chromium, but the underlying mechanic, yes.