Lets talk about nerfs for a second

Nerfs to champs seem to be more complicated then they actually should be when just changing the kit of a champion could be all that is needed for the champ to not be op:

Darius: if you make it so his passive doesn't proc black cleaver boom you've nerfed a lot of his unseen power

Garen: change the extra true damage he does to the villain to physical damage so you can actually play against it boom simple nerf done and done

Skarner: I actually think the slow change will do alot to cut his power so he's good now i think

Mord: Make his health costs cut through his shield when using his abilities as the spell also gains shield boom done

and so on the point is you don't really need a numbers nerf for alot of the new champions just a slight tweek to how certain abilities work.