I have been trying to unlock Bozja. It is locked behind the raid in Stormblood (as a side note, why? Are the two stories connected at all?). Anyways, I queued for the first raid last night at what I would say prime-time, around 8p.m. The queue took 50ish minutes to pop. In my opinion, you should not have content in the game locked behind the story. I mean the story is great, I love it, but when it gets in the way of people actually playing the game, you have a problem. Just my $.02.