User blog comment:A.J AL/Where does Death fit in?/@comment-109.66.36.57-20160528133306/@comment-1975828-20160528144156

I doubt Death and God hosted tea parties or such. There's always a chance they never met, since we don't know how long in between Michael's creation and Amara's imprisonment was. It could be two decades, two thousand years, or one million years. We don't know.

"First" could mean, "first in affection". God deemed Lucifer his most cherished son, so in a way, Lucifer was his one true and only son. Amara did not outright state Lucifer was the first born.

That third one however, can explained through grace absorption. Amara did not know who Castiel was, but she recognized him after consuming Ambriel's grace. There's a chance Ambriel knew who Metatron was. I believe they work in similar divisions.

I'm not trying to argue, but these are things to consider.