I don't think that Sja-anat ever really implies that she wants to be on the side of Honor or Cultivation. I think that she helped the mission group escape because she likes Shalan in particular, perhaps because Shalan's damaged mental state is somehow connecting her to the unmade.
Thanks for the welcome. I have read all of the cosmere books my favorites are the original mistborns though they are closely followed by stormlight. If I could be any twinborn I would be A double chromium twin born and dance through life. without compounding I would go with steel for allomancy and iron for feruchemy. I know a fair bit about cosmere, everything from the books as well as hoid and his connections in most of the books.
When you guys are discussing the storms on Roshar, I believe there is evidence that there were already multiple storms circling the planet. When the main character from the Parshendi parts goes to bond the void spren she mentions storm riders or something like that. She mentions that there are multiple storm riders which implies multiple storms.