Since it's been such a long time and the chances of backlash are less would you consider revealing the Shadowed One's name?
No. For one thing, a name that was legally approved years and years ago might not be now. It could have been trademarked by someone else for something else in the interim. I have no way of knowing that. So attaching it to BIONICLE after so much time would be a legally shaky thing to do.
Can we just assume his name IS the Shadowed One?
Well, no, because it's a codename, like the known names of most members of the Dark Hunters.