So yesterday I put Obake and Kami in with Ulalena and Glitch. That wasn't the plan but Kami refused to be caught by me (she is still my shy baby). So I put Obake in first, and then, when Kami was all by herself, I was able to catch her too and put her with the others.
They slept peacefully the whole afternoon. Into the evening I started to hear small noises from the pouch, but no hissing or crabbing. Glitch woke up first, then Ula, then Kami, and finally Obake.
They did fine all night and this morning, so I'm going to just leave them all together.
On a side note, I think Obake thinks he has a magical bark. Every time he has barked all night, another female has appeared. Last night he was barking again, probably looking for more girls to join his colony. He also seems to "stand guard" quite a bit. He actually wiggles his tail like a little lure, too. He cracks me up.