Um yes we know that. It doesn't revert the kernel or radio because it cannot. This whole thread is about reverting the kernel to get on the update path for the OTA. Using the method above does what you say, reverts the system software to .886 and leaves the radio/kernel on 5.7.893's version. 5.7.893 is not the final version that will come out so while your radio/kernel are good for you now, they might be better in the official OTA. And because your kernel is not stock, you might not be able to take the OTA. That is the whole point. anyways, it doesnt matter since moto will fix they said if the real ota fails.