I will try to shead a little light on the subject of how do you reach ikkyu with such problems? I don't know, this is probably my driving force in trying to correct the issue. My kohai's technique is very good, nobody agrues over that point. Basic ukemi is also good allowing the student to roll out of kote gaeshi etc which is abused in that it is a means of escape. Only tobi ukemi is a problem, and yes the student has suffered injuries due to being unable/willing to taki tobi ukemi. The student may also have injured themselves on purpose, so you can see how serious the situation is. Our club prizes ukemi above all and my kohai is an exception which has gotten out of control.