[spoiler]im not one for trying to make big predictions, but after watching this episode, im betting suyin is part of the red lotus as well. finding out that unalaq and aiwei were part of the red lotus too suggests that there might be more members who weren't captured, and that their network might be as big as the white lotus even. particularly because of zaheer's reveal on what the red lotus's goals are, and thinking about su's line about the earth queen to korra, something about how the queen thinks she can do whatever she wants and how monarchy is outdated, and then asking korra what she thinks about it, prompting the same philosophical thought that zaheer provoked in this episode. also other possible hints, like when it turned out that aiwei was a traitor, su didn't seem all that surprised, and then su sending korra and the others off that night secretly, su's anarchistic past, the fact that she traveled the world in exile for a long time, etc[/spoiler]