Most sumo fans, outside of this forum, couldn't care less about the "specifics." The bottom line is that there is mutual cooperation going on. The important thing about the "insider" information is that we get an idea of what people within sumo think of their peers.
I get that, but barring corroboration as to their identity I'm just not willing to accord "insider" status to just any anonymous poster at 2ch and the like whose claims look like they make sense. I could've come up with a list nearly identical to the one you mentioned just based on the theory that anyone who survives in juryo for more than 15 basho or so (without significant time in either maku* division) must've engaged in some rigging to do it, and I'm assuredly not an insider. Maybe it really is as easy as that, but in that case any inside info that doesn't actually name any specifics just isn't very "inside".
From the time of Itai's revelations, it had been made clear that money per se isn't the main reason for yaocho. It is maintenance/preservation of rank. Why do you think ozeki and lower juryo are two areas where cooperation exists the most? Those guys have the most to lose. The money involved is just to keep score. If at all possible, the debts are repaid on the dohyo. That's why the "debts" are passed around and around. A middle man, nakabon, would not be needed if each debt is paid off immediately. The only time that money is involved primarily is when a yokozuna is involved. Obviously, he cannot repay his debts on the dohyo.
I'm the last guy who needs a reminder why juryo is particularly susceptible to it.
My point was slightly different though - if these guys were truly (and only
) "cooperative people", money wouldn't be needed: From time to time, you willingly give up a win to someone who (looks like he) needs it, and if he's the uncooperative type who doesn't want to repay of his own volition when the tables are turned, you just cut your losses and exclude him from future niceties. Yes, keeping track of disparate obligations by assigning monetary values to them makes it easier to trade them around between otherwise unrelated parties (i.e. settlements that go beyond one Samplenoshima-beya guy "paying up" for his stablemate), but at that point things have moved from "cooperation" to "fraudulent business", IMO.
But maybe I'm overestimating the need for internal justification before a rikishi decides to step across the boundary from one to the other.
Edit: Was it Osaka basho before which all the sumo people with a collegiate background are having their big annual meeting/pep rally? That could be an interesting event this year if the open evidence keeps pointing towards a large Nichidai bout-fixing network.
Edited by Asashosakari, 02 February 2011 - 21:44.