Everyone takes Kohaku as a he since angels are genderless and he slept for 100 years, so yes, that means this happened while he was asleep.

Piling up of facts for a monthly story is something I don't particularly want to see that badly. It means more waiting time for the resolution of any of said facts. If we're having so much trouble waiting on a weekly story, imagine how it would be for something that comes out once a month and with less pages! Especially looking like they're adding so many things and connotations they'll have to explain later.