Big Evil Spider AO considers all gates opening to be considered a Gate Burst...so does this apply to Arkham Encouters where your unlucky enough to get a "Gate and Monster appear"?
I've been playing it as a yes!
Further more whenever you draw a Gate Burst card all flying monsters move and Big Evil Spider AO turns all the Mythos Cards (with a gate) into gate burst so basically all the flying monster are going to be moving?