Shamo in Japan today have all the skills necessary. The issue is each prefecture in Japan proudly holds individual preferences on style and type. But it's all there it simply comes down to the breeders.
The old skool guys traditionally don't blend styles from other lines. The younger, active underground, group generally blend prefecture styles with impressive results.
It's part of sport. Don't get me wrong the old guys lines of Shamo have changed too. They have had to in order to compete against their prefecture rivals. It's just happen within their traditional Japanese form they enjoy.
What the old guys joke about is the young guys are always coming back to them ("the well") for Shamo :-)
The Japanese shamo of to day is as Paulo says light years ahead of the Jap shamos of 15-20 years ago, people say that finsterbusch rated the Indian aseels as the ultimate game oriental there is to found in tape boxing and naked heel, but this is not so as he says in he's book cockfighting all over the world,he says that in naked heel the Japanese shamo as no equal, and he says in he's tests with the Japanese shamo in naked heel they could out 2 ore more opponent's of the best naked heel fighter he could find, im the first to admit that for tape boxing and under Asian rules for tape boxing that the Japanese shamo would not do well in pure forme, unless they were breed for tape boxing over many years to get the shamo to fit in to this category and be competitive in the tape boxing pits of to day , ore to cross the Jap shamo with to days modern tape boxer's. But for the sport of natural sharp naked heel i think that the true pit breed Japanese shamo is still up there with the best in the world,