Let me pour some more fuel to the OBSC theory :-)
I`ll just modify it a little bit:
- Harumafuji is definitely not in the club as he is a fresh ozeki and has to gambaru for some time;
- an ozeki on kadoban is likely to be "helped" by other ozeki;
- an ozeki with 7-7 record in the current basho will win in the senshuraku against an ozeki, who is already KK.
Then I'd say the OBSC was founded sometime in 2008. Here are some facts and figures:
Haru basho 2008:
Chiotaiaki is kadoban. In day 10 he is 6-3 when he faces Kaio. Chiotaikai wins and goes KK in day 12.
Kotomitsuki is 7-7 when he faces Chiotaikai in senshuuraku. Guess what, he wins...
Kaio is 7-2 in day 10 so he can afford himself to lose
Natsu basho 2008:
Osh is kadoban, but he gambarizes and goes on to win the basho.
Kotomitsuki is 7-7 when he faces Kaio in senshuuraku. And guess what, he wins and goes KK again
Kaio is comfortably 8-5 in day 13, so he can afford a loss
Nagoya basho 2008:
Chiotaikai is kadoban. In day 9 he wins to Kaio to become 7-2. In day 11 he wins to Kotomitsuki for 8-4.
Kotomitsuki was comfortably 8-2 when he was facing Chiotaikai.
Aki basho 2008:
Osh is 7-7 in senshuraku when he faces Chiotaikai (who is already KK). Guess what, Osh wins
Kyushuu basho 2008:
Again, Osh is 7-7 in senshuraku when he faces Chiotaikai. Again he wins
Hatsu basho 2009:
Kaio is kadoban and ganbatteru. Wins to Chiotaikai in day 9 for 6-3.
Haru basho 2009:
Kotomitsuki is kadoban. Wins against Kaio for 6-2. I'm expecting him to win against Chiotaikai.
Now for the Kotooshu-Kaio bout in one hour. Kaio is already KK, Osh is one shiroboshi away from it. Even if he doesn't get it today, he'll get it against Chiotaikai. The OBS Club is at full work!
(East wins...) :-S (East wins...) (On the banzuke...)