Since you know about the tournament between the Fusen Ryu and the Kodokan, I assume you know that the Fusen team won largely because of their superior newaza. The older ryu of Jiu Jitsu, including the Kito and Tenshin Shinyo schools, did not do newaza in the sense we know think of it. They used many of the same submissions and osaekomi, but in different ways. They either applied the techniques standing, or they would go to the ground (if the opponent landed softly from a throw or by using a standing sub to take the opponent down, for instance) and immediately apply a finishing hold or blow (usually from an osaekomi position), then stand up. They did not transition between hold downs, or fight from the guard, or spend minutes working for a submission.
It would not have been appropriate as these arts were meant primarily for battlefield combat when the student lost his weapon, secondarily for street fighting defense, never for sport (at least not what we think of as sport; tho challenge matches happened, they were generally quite deadly). But when the Meiji Restoration came about, there was no longer a need for JJ on the battlefield. It was during this time that the Fusen Ryu developed, and created newaza, i.e. what we today think of as "groundfighting".
After the Kodokan team lost, Kano asked the Fusen Ryu master to teach he and his team their newaza. Kano was very open minded about what should be a part of Judo. So they learned, and that is where the concept of newaza in Judo comes from, tho many of the actual submissions and hold downs had already been inherited from the Tenshin Shinyo Ryu. Now to fit this in to your questions. Kosen Judo is not a "style" in the sense that Shotokan Karate is a style and Ryukyu
Kenpo Karate is another style, both of the same art.
There isn't that much distinction between Kosen Judo and Kodokan Judo, because it is ALL Kodokan Judo, their is no other Judo. However, there are different traditions of Judo. There is the Kosen Judo tradition which was developed largely in the universities of Japan early in the Century (read the thread about Kosen Judo for more details on the system itself), there is the Zen Judo tradition which is very much focused purely of self defense and does a lot of kata, there is the Kaiwashi tradition which is the Judo Kawaishi brought to France and it is very similar to Kosen Judo, and a few others. But they are all Kodokan Judo, they aren't separate styles. So many of the Judoka at the Kodokan were also Kosen people. "Kosen Judo" was originally just a group of standard Judoka who practiced mostly newaza. I don't have specific information as to whether or not Maeda was one of these people, but given the time in which he studied Judo and the direction BJJ has taken, I would say it is extremely likely that he was a Kosen person as well as a mainstream Kodokan Judoka.
Many of the great names of Judo, like Kawaishi and Mifune, were. And as for any relation between both Maeda and the Kosen people and the Fusen Ryu, I doubt whether there was any more direct a relationship than there was between any other Judoka and the Fusen Ryu: they contributed most of the concepts of newaza to Judo. Maeda learned these concepts as a Judoka, and so did all the Kosen people. So the relationship is between the Fusen Ryu and Judo in general, I do not of any further relationship of either the Kosen people or Maeda to the Fusen Ryu, and tho one is possible, there isn't really much evidence to support it.
The Kosen people are specialists in a part of their Judo, but what they are doing is still Judo. They may do certain things that a lot of mainstream Judoka don't but that is just because it is a part of their focus, it to me doesn't point to any influence outside of Judo.
x-ray
ZASŁUŻONY
), że w pewnym momencie w judo (właśnie pod wpływem lań od Fusen-ryu) zaczęto walczyć głównie w parterze! (Jeszcze przed wyodrębnieniem się Kossen judo) Po prostu od razu sprowadzano, choćby i siłą, do parteru i tam kończono przeciwnika.
Jodan
Krzysztof Piekarz
Ziar
Yojimbo
