Questions about venin power... (OS Spoilers)

Ok so we learned some venins have their own signets in OS, but we don't get much details, leaving so many questions! Here are some of mine:

• Not all venin were originally dragon riders, which begs the question: do venin develop signets through their power from the earth, or do they get them based on their pre-venin experiences?
• Do only Sages or higher gain signets? Or do only special or strong venin get signets?
• How do they get signets? Maybe by becoming a Sage and "claiming" an initiate, since it seems like there is a bond that is formed through this based on Xaden's language in Ch 65.
• Do rider-turned-venins keep their signet from their dragon bond, or get new ones... or, would this depend if they keep or break their bond with their dragon?
  • Will Xaden get a new signet, will he still be able to read intentions and wield shadows (again, maybe this is dependent on his bond with Sgaeyl)?
• Do we think Berwyn's signet is dream-walking and Violet is the magic balance to him?
• Theophanie is a storm wielder. We know she was a priestess of Dunne, likely from Unnbriel, not a rider. Was her signet from her time as a priestesses? Do priestesses even have their own signet powers (this seems unlikely to me)?
  • If priestesses don't have signets, how and when did she get her signet? Has anyone mathed out the timeline on Lilith yet, since we know she was her magic balance counter?

I know we don't have a lot of information and I don't really have many theories. I'm mostly curious if anyone else has theories, what your general thoughts are on venin signets, and what you think the implications of them might be in the book! Do you have any other questions about the venin signets?!