Good question! It’s a first come first serve thing, so whatever gets published first becomes canon. As the editor, I’ll be working to make sure nothing contradictory gets through, but of course stories take a while to write, so there’s potential for overlap. Ideally, it can just be streamlined into something that works, but feel free to leave a comment in the “Resources” area dibs-ing a certain event, person, etc., and I’ll add it as an unlinked story to the top list.
Also, multiple people can totally write about the same character, just so long as it works with the story! If someone wanted to write about a younger Tyler, say, or possibly a Tyler that survived the gunshot and wakes up in a hospital a week later, you can totally do that!