Since it's a Featured History, it's in the interest of the whole site that it stay stable and not be messed with. Probably we should add something like that to our Adoption Policy. Most of the time, if a member stops contributing and doesn't respond to messages, you are allowed to add to their timelines (but you may not erase their previous work). In this case, I would say that unless Salnax gives some kind of permission, you should leave it as it is.