Sion Jungle is a hidden OP

Well almost at least. The issue i have found with Sion is he's not great at ganking pre-6, do-able, but not great. In the meta where the top junglers are ganking at 4minutes level 4 Sion can't really compete.

HOWEVER: think about the jungle changes by themselves, Sions clear on some of the harder camps is INSANELY fast. And with his stacking health W as long as you mass clear your red side, you can get way more health from it than you used to. On a good game you end 700-1000 bonus health from your passive, On a bad game 400-700. And with the EXP buffs the new jungle brings Sion hits his level 6 faster than before.

As long as the jungle doesnt change TOO much to nerf the current junglers, Sion will be next runner up for a strong tank jungler.