If you read what you wrote and read what I wrote then you'll see we are in agreement. "Obviously if you repel an attacker by knocking him down and then jump on him" and then continue to attack be it by GnP or by jointlocks / chokes then you generally are seen to have turned into the aggressor. You are no longer considered to be defending yourself when you have completed defense, and then instead of disengaging you follow them to the ground and resume the fight. I've never said groundwork is not good to have; it's more then necessary especially for little people like me. You just have to be very careful in your application of it.
My bad if I misread your intent.