wait what about him killing an angel doesn't that scale to 1-A?
Time of Judgement itself isn't exactly clear on if the Angel was a literal angel or if it was metaphorical.
When I made Caine's profile, I took it as real since it seemed likely at the time, but now I've got a more complete view on the verse, I don't think so, or at least, I don't find it persuasive by itself for a High 1-A rating.
Iirc having other people do the dirty work is how Lilith kills Caine in one of the Gehenna scenarios.
It is, but they are separate entities to her, she couldn't summon her armies of Umbral spirits to do it.
Likewise, it's why her vast number of Hax wouldn't work on Caine, no matter how indirect they were, entirely because of how the Seven-Fold curse works.
In that same scenario, Lilith has to keep trying to stop herself from attacking Caine when he kills one of her Apostles, since when one dies, she attacks Caine for that instant.
The only thing that could kill Caine, besides Diablorie (which wouldn't go well for the Diablorist) was Malakai's unique Discipline which redesigns the world around you to a far greater degree than Chimerstry or Dementation can. The first of which lets you define what is illusion and real, throw people into illusionary realities where the pain they feel is real, block out all of their senses, including extrasensory ones, leaving them in a psychological hell or just declare their nightmares to be real.
Dementation on the other hand lets you speak "Truth beyond truths" and drive someone insane, summon the concept of a sword to cut someone with or fundamentally wreck a victim's sense of reality, changing a fundamental truth of their victim.