Is he Large and In Charge?
Nah, that's the Beastie, Lancelot:
Edmund will just quietly merp at you until you pay attention, and if you don't notice in a few minutes he sadly wanders off; you know, because as a cat he's naturally neglected and we never pet him for hours and hours at a time, and he doesn't get special treats whenever there's cereal or string cheese around. But the Beastie will headbutt you until you pet him, even if you're asleep. When it's time for him to get affection, he's going to get affection, dangit. He also has a bit of swagger to his gait, so he's kind of the enforcer of the house - when the little old lady cat isn't involved. She's always the boss.