About Envoy Armor
Yes u ultimately get 2 sets. Envoy 2 is used in the mystic forge as the precursor for each piece. Envoy 1 u can do w/e u want with it. If u dont care about crafting leg armor u can keep Envoy 2 and use it as u want. Basically everything u assumed is correct.
Yeah. First set of armor is just a free ascended set. Second one is an actual precursor.