I only saw this post now or else I would have posted earlier...
This was way back in DI lore and may become very relevant if what you say comes to be... And I quote:
"Azmodan believed that with the Three set loose upon humanity, the Angels would be forced to turn their focus upon on the mortal plane - thus leaving the Gates of Heaven abandoned and defenseless"
http://www.blizzplanet.com/?action=C...wpage&pid=358/
As per usual a lot falls in place with what you are suggesting...I am pretty confident that we will get to do with more than a few Angels in DIII.
As to some of your other comments: I think that Inarius will be a loose cannon, someone that might get in the way of both heaven and hell, at the same time... Would be cool if the forces of both good and evil need to work together in stopping him doing something...
Well that’s what I would do if I had anything to do with the lore... Also, I think the story might turn from Heaven vs. Hell into more fragments... In hell, Traitors vs. Brothers, in Heaven, those for and against Sanctuary. With some of the fractions working with “the other side” to advance their cause... With everything culminating in the mortal world.
I hope that your short story is well underway and that we get to share in it soon...