Regardless of if it's Imu or Kaido that was given "immortality" from the Op Op fruit's last users "surgery", I can easily see Law's "Gamma knife" being used against Kaido at some point and leading to his defeat. Whether it results in a near instant death, or slowing him down enough for Luffy to beat him and have him die as a result.
Law was explicitly given a technique that CUTS PEOPLES ORGANS FROM THE INSIDE. The only time he's used it so far was on Doflamingo, who ass pulled sewing his own organs together with his fruit.
I truly believe that since the auction house, we've been set up for a Law, Luffy, Kid vs. Kaido set up. And I think its likely that Law's ridiculously powered fruit will at least lay the circumstances for Luffy to bring Kaido to death's door.