Not sure if this helps, but during a recent grading of 3 pupils for 6th Kyu Sensei threw in some free practice against 2 opponents!! (Jiyuwaza?)
Came as a shock to the three gradee's but they coped really well and surprised everyone!!
Obviously the pace and strength of the attacks was such that they wouldn't hurt each other, but it really made them work!!
They had been told before the grading that Sensei would likely ask them to show her a technique of their choice and even their instructors were taken by surprise!!