I know I missed something, I'm trying to figure out where. Madame Gao is part of the Hand. When was it first introduced that way? I could of sworn that in DD season one she was only on the same side as the Hand because she was in cahoots with Fisk, who was in it with Nobu, who was Hand.
Obviously the Hand has different factions and in each of them possible conflicts with one another, as seen in Iron Fist, but I just can't recollect when it was stated that she was Hand.