Just wondering, what is your usual route when jungling Riven?
Also, you might want to rethink your positioning of Cho. He's a fantastic jungler (minus the ganking) and has the best dragon secure in the game! He's also very flexible/adaptable in jungle as well as build options, being able to be played Tank, AP offtank, and Attack Speed based on the situation. Although you may say that his CC is unreliable, it's quite easy to predict a player's movement in the narrow channels of 3v3. Good CC, great jungle presence, amazing versatility, and the best dragon secure in the game? I think Cho is more deserving of a higher tier