[Steve Van Doorn]

said, ":: Grey hat plan ::
I wonder if Sun Tzu would accept the concept of “gray hats”?"

Chapter 1 page 1 next step in the plan
2. It is a matter of life and death, a road either to safety or to ruin. Hence it is a subject of inquiry which can on no account be neglected.

y(x) = mx + b
y = death
x = life
y(x) = safety


Some must die.

[Cletus.D.Yokel]

Still, gray hats are an Hegelian construct.
The implication is that gray hats work for both sides, harming neither. They are the synthesis of opposing positions.
Hegel says, they cause progress in the resolution of conflict.