Graves is allowed to be a tank and carry
And gets 120 armor/Mr without much effort and can do this regardless of # of enemies
gets 40 armor/Mr and only if he's near them.
When you give recently redone champions, super steroid versions of other champion's kits that fulfill a different role it seems really silly to be surprised that roles shift and become less used in their normal role.
It also seems really stupid to nerf things like top nautilus for being viable. God forbid tanks exist.
