I'm interested in hearing peoples' fan theories that might not have a lot of canon support. Or might have no canon support. All that really matters is that you think they're neat. I'll start with an example:
Rhaast was a Baccai who survived by being really good at killing things.
Since we have very little canon info on either the Baccai or Rhaast, this theory has next to nothing backing it up. In fact, it may very well have _negative_ canon support. That's what I'm looking for here. Go nuts.