On a side note - Daido Juku is it's own thing right now. It's more akin to amateur MMA in a gi than kyokushin. The only aspect that reminds me of kyokushin is the kihon - that's about it.
There are hardly any Daido Juku schools in Southern California. Maybe one that I know of. It's interesting that the "osu osu" cult isn't there. I would imagine it would be one of the first things to carry over. Even maybe with some Takashi Azuma this and that, but definitely not at the level of Sosai Oyama this and that.
Not that I know of - maybe
@destroyer4147 can chime in.
No, I haven't heard of these rules going by any new name, official or unofficial. Pretty much, just "new" or "revised" kumite rules.
Wait, what?
I did BJJ briefly and did not hear a single osu ever.
Oh, goodness...you should see the scene here in Southern California. What was once distinctly our cult slogan of "osu! osu!" has now been hijacked by pretty much the entire BJJ community in the form of "oss! oss!" or "oos! oos!" where the cross-juji bow has been replaced with the hang-loose hand symbol. It seems to be something that started happening in the mid-2000s, especially with members of BTT. However, there is a BTT academy here in Long Beach where many of my friends train, and I asked them about when "oss! oss!" became a thing for BJJ, and they all say it's been done in BJJ since the 70's. Yeah right. It may or may not be true though, as I have read that in Brazil, BTT had a striking coach who was a Kyokushin black belt who brought the "osu! osu!" into the BTT training culture. One thing is for sure, the BJJ community as a whole has NOT been "oss! oss!"ing since the 70's. This is one example of BJJ cult mentality. A shining example.
I've been to several Shotokan (JKA and SKA) and Goju (Shin-ryu) dojos at the invitations of several friends. Not a single "osu!" in any of those dojos. I asked my Sensei, and he said it became popular in the karate world within Kyokushin. Aside from the BTT Kyokushin striking coach story, I have no idea how to explain how "oss!" became a thing in the BJJ community.
Just a personal thing, but the spelling of "oss!" and "oos!" that I see all over social media by BJJers bugs me a bit too, but that's just because I've been osu'ing for years.
Also wondering, why would someone choose to zanshin after a head kick instead of following up with more strikes en route to a KO?
This is exactly the point I was trying to make. Before the new rule, if the high kick didn't drop the opponent, they'd just keep on fighting! The judges would then factor that in when making the decision to declare the winner. Now, a ref sees a zanshin after a high kick and immediately pauses the action and awards the waza-ari, even if the opponent who got kicked is perfectly fine! The traditional scoring criteria for judges are:
1. Damage
2. Effectiveness of the technique
3. Total number of techniques thrown
in that order of priority! The new high kIck + zanshin rule pretty much allows a fighter to win by 2x waza-ari without giving much weight to criteria numbers 1 and 2.
Kyokushin fighters in general have developed over the decades some of the most sophisticated powerful high kicks of any martial art, and are capable of KO'ing an opponent at any range, including chest to chest. IKO-1 fighters will develop bad habits with doing zanshin after every little high kick, and it's a habit that'll result in less powerful high kicks overall, as well as one that'll get them killed in crossing over to KB/MT/MMA!
Iirc, Japs also pronounce it like Oss.
