Garret and Lieutenant Dyester were both smarter than Khan in their specific fields. Their reputation was well-earned and proven in many instances. Their strategies and ideas reeked of pure wisdom born from experience, but Khan couldn't stick to their methods.
As always, Monica was right. Khan had never played by the rules, and they had never applied to him, either. He had often pretended to abide by them to retain a degree of connection with the rest of the world, but that time was long behind him.
Lieutenant Dyester's strategies were perfect. Garret's suggestions were brilliant, but Khan saw a different path. Strength was everything on the battlefield, and he wielded enough of it to enforce his own rules. An entire planet was too much for Khan, but the remaining quadrants were within the range of his abilities.