The sort of training you're talking about has been done in the Jiyushinkai for many years by advanced people. We feel that sandan level is the beginning stage for this type of training and by the time yondan is achieved, the budoka must feel confident with speed and power.
To attack and make waza with a high degree of speed and force takes highly skilled budoka who have achieved a state of "not caring who wins" and who train with very strong levels of trust.
There are many things to consider when attempting this training. It is dangerous and we must remember that the energy put into the mix has to be dealt with by very good ukemi.
I don't know what Ota san is doing so I can't compare. I do know that it's very "juicy" and a little bit goes a long way!