No it's not, there's no trips in greco and there's no leg attacks like in freestyle. Also, you have submissions in Judo. That changes everything. It could still be considered like a new type of wrestling but with different rule sets.
Yes, Kosen Judo is Judo except in Kosen Judo the Newaza is stressed equally as throwing. Traditional Judo due to competition may focus is some dojo's 80-90% throwing and 10-20% Newaza. Kosen Judo is the inverse of that rule. 80-90% Newaza and 10-20 % Throwing. Those are not exact statistics but you get the point.
KOSEN (高専) is just short for _"kōtō-senmon-gakkō"_ (高等専門学校) which means technical college or college of technology. That's where that "style" of judo is practiced. Unfortunately, most kosen judoka after graduating usually end up joining schools that teach regular Kodokan curriculum (mainly stand up).
@@Midnitedreary88 Assuming a person can afford it. Jiu-jitsu isn't a "poor" man's art. Martial arts in general have always been a luxury, jiu-jitsu in particular, especially in the bigger cities. Name one well known practitioner that comes from the hood or barrio? Not too many Luiz Franca or Oswaldo Fadda's running around. I lived in the west coast and had a well paying and could barely afford it. Now I live in a small town with no jiu-jitsu in sight. The closest schools are a good 60 miles away in the big cities ($$$). Even the keikogi are ridiculously overpriced. I wear both judo and jiu-jitsu gi and other than "cut" see no difference. Rener Gracie loves to say _"jiu-jitsu for everyone."_ Yeah, if you've got the money. Speaking of Rener, he and Ryron charge $185 for blue and $225 for purple belt tests. If you've got the money, learn it. But if you're looking for something more affordable, judo is an option.