OP I think you should focus on what your guild could do better next time instead of pointing fingers at uncontrollable events (griefers).
The fact of the matter is you had a free shot at azu before the allies started to show up and half the raid got Mark of Frost, but that attempt was wasted.
I could go on a looong rant about what could have been done differently, but I cba to do that here on the forums since I don't even know if you are focused on improving or if you're just whining and trolling like the vast majority of people on these forums are.