Arcade mode nightmares

So I have just about done everything this game has to offer. I have 4 100% characters - one for each class - Arcadea is maxed out, and I just beat arcade mode with every catalyst. I was just fooling around when I spoke to the bishop and looked at the touch-starved nightmares tab and noticed something; I only have 3/5 nightmares unlocked, with the other two stating I need to progress further to unlock them.

Is this just something that was forgotten about in development? Because again, I have 100%'ed arcade mode. (If you want me to beat it again with no leveling and all elite enemies, that's gonna be a 'no.')
 
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