The knockout list doesn't work, even if you "do it properly" do the unlocks all on one character. You can buy engrams for silver, and have them open into duplicate items. This is unacceptable, and may constitute actual fraud, if you pay for engrams that should only give you one of three exotic items you have left in the knockout list you shouldn't get TWO OF THE EXACT SAME LEGENDARY SPARROW, AND A DUPLICATE GHOST SHELL. This event was extremely poorly implemented, and a slap in the face to dedicated players.