Hey
As far as I understand Sequence Node, is that all will be called in order but without any delay. Meaning if you have your delay in Then 0 it will consequently not Delay Then 1 Sequence but just follow-ups in Then 0 if there was one.
https://docs.unrealengine.com/latest/INT/Engine/Blueprints/UserGuide/FlowControl/index.html#sequence
Best