@Roxas I had removed kido from Mayuri on purpose for just the overpoweredness it causes, and I nerfed his poison so that it wasn't lethal (hell, it barely does anything). His paralysis ability comes from stabbing someone with his Shikai, and anyone who can keep the blade from stabbing him can essentially stop himself from getting paralyzed, and we have a LOT of people who can do that. 

As for Kurumi..... hmm, maybe you've got a point, even though all the Kurumis who were killed were just clones, and that the original never really showed up in any of those, but hey, I still nerfed Kurumi so that she couldn't cause spacequakes and that she didn't have her City of Devouring Time. Those were the really bad abilites. I could possibly nerf the clones a bit more... hmm.