I have a group with an Yseros Avatar in it, and 4 Angels that are unfused. They gain 2 additional Angel traits at the beginning of battle, however they only gain from Pyre, Rime, and Scourge. I have 3 other Angels known to me in my Bestiary, 2 of which are in my group, but those traits never are used. Additionally, the Angels that have Rime and Scourge traits innately get a duplicate of those traits about half the time, which should never happen according to the trait description.
Thanks, fixed in the next patch!