After you have finished all main DB quests and you have those two followers in the Dawnstar sactuary, do they respawn? I need to level up my Ebony Blade and them giving themselves for the better of my blade seems right up the DB alley (so to speak). But I would want them to respawn so I have more.

Thanks.

Well, I can't kill them in my game.

I assumed if you hired them you could kill them like you can other followers.

From the wiki. I'm guessing if it's not a bug and they're essential, they won't respawn. But you wouldn't be able to kill them anyway.