Boy, this book doesn't get much love on here.
In the first book Mr Gryphon gets Warbringer to collect three items. He appears to have all 3 by the subway clash, then we see Mr Gryphons interference stopping Thors hammer punching a hole in Warbringer, and Warbringer leaves. (Madam Masque is also collecting artifacts in Invincible Iron Man, with Masque having some pretty awesome powers of her own). It doesn't look like the Avengers can beat this guy Warbringer.
Another curiosity about Avengers, is that both issues #1 and 2 are designated "#1 2015", and "#2 2015", but no other ANAD books are including the 2015 year. I wonder why that is?
Also, it looks like this Avengers arc is before the FCBD ANAD Avengers, because this arc is their first fight together.