shyvanna is listed twice and i would say she is a tier one jungler. I would drop gangplank down one, and I am pretty sure Shyvanna is a much faster/stronger jungler than riven. Riven is a better solo top in my opinion, good when paired with ap bot and a hybrid dmg or cc jungler. My team ran orianna as a main part of our team comp last season. I do not think we ever lost when running her. After the nerf i'm sure she has fallen but she doesn't deserve tier 6.
I would rather fight tryndamere than chogath.