Often times when we practice we use a stylized attack. It aids in the learning process. The yudansha at my school tend to work now with no set attack. Any side, any attack, it does not stop on the ground, distance respected and maintained the whole session.
Some things I would like to point out. We are not measuring distance after every move. We know the distance. We are focused on the other person at all times. We never know when the next attack is coming, or from where. The attacker is an active part of the equation, always changing and reattacking. Even on the ground the action continues, though it is hard to see. The deposed attacker continues to look for feet to hook and problems to cause.
In case you are interested, we have our training kusari fundo in our belts. We were practicing with them before we started randori.
I think there is some sweet stuff here. I hope you enjoy.