I don't understand the question. It's not like a ketogenic diet results in a lack of blood glucose... which is good, because if it did, it would kill you.

https://en.wikipedia.org/wiki/Gluconeogenesis

As you are getting INTO ketosis you will have a window with lower glucose in your blood, and according to this less self control.

As your body begins to burn fat to create its own glucose, your self control should be very constant, never dipping to low from lack of glucose.

You don't get super-self control from a sugar high, so there is no benefit to high levels of glucose in the blood. Its just good to avoid the extremely low dips which someone in ketosis will never have.