If you've ever listened in on our broadcasts you'll probably have heard me raise this issue.
The concussion / CTE issue, when awareness seeps through here, is going to be a huge one for sumo.
With no equipment or rule changes that can be made all they can really do to lessen the impact (pun intended) in bouts is go back to the 70's style tachiai.
These kind of training practices in this day and age (especially with kids) should be made illegal.
I'll admit it's something I used to do as well because just 10-15 years ago there wasn't the current level of awareness among the general population about how ANY impact to the head has repercussions.
Coaches who have kids ram their heads into a solid wooden pole again and again and then wonder why there are no young recruits are a big reason many parents won't let their children do sumo.
They need to be educated and their practices changed.