Minato had never intended for the limiters to be permanent.

Kushina had designed them carefully, to hold firm but also to dissolve as gently as they were applied, to be removed like a pair of old gloves when they were no longer of use, as soon as Kakashi no longer needed them to rein in the deadly manifestation of his grief.

But Kakashi had never really managed to control the power that rose so sharply in the wake of his pain, and by the time he 'd even recovered enough to really try, Kushina was dead.

So the limiters had stayed. Kakashi had never needed much chakra to be deadly ' even with the limiters and the constant drain of Obito 's sharingan, he still had more than enough to be very, very dangerous.

And after Rin, and Minato, and Kushina, there had been no point in taking it farther than that.