It does NOT matter if a cog invasion is in place ever..
its just the cogs that are from a cog invasion..
So if the invasion ends but the cog you are batlling,
is from the cog invasion but the invasion ended,
you will still get all of your points for the
gag(s) used on that cog and for every gag(s)
used on a cog not from an invasion, will not double.
Hope that helps a little bit. =]