Originally Posted by
Roentgen
Well, to be honest, I have no definite way of knowing if it actually does. I only noticed that it had been working for me during the last event. I've been leaving the boss up since then when collecting event currency because I think that by doing so, I would have removed the raid boss variable after a stage clear (to which there are 3 expected outcomes: RB, SG, or none). That leaves 2 outcomes, so as an answer to your question, I'd say leaving a boss up does affect it, somehow.