I don't mind the cleaver on AD caster themselves, its that the debuff apply to all opponents which basically give a huge damage increase to your ADC. Its bad enough that ADC is only thing that matters past mid game, now its even more of the support babysit ADC, everybody else dives the enemy ADC, which team ADC dies first loses.
Either change the debuff so it only affect the person applying it (different version of LS), or make it so only autos and single target ability apply one stack with 1 sec cooldown. Basically champs like Talon can't just ult and suddenly your entire team lose 30% armor l0l.
Reality is defined by your imagination, the catch is to convince yourself what is and what is not.
Something will always seem stronger then others. I'll admit Khaz is a rough mid to lane against but they usually win based off countering or the other mid faulting and giving him the advantage. I think AD in general needs a nerf, or buff AP so we can actually see a damn caster mid again!