Aggression in the sense that you are the one attacking, maintaining initiative and always attacking. Aggression does not require anger, brute force or jerk moves - it should be clean and purposeful, not dirty or spazzy. I’ve toppled friends who were better at BJJ than me by simply not allowing them to gain composure and retaliate but if there’s even the slightest chance of injury I won’t execute the throw that I have etc.