Welcome to the forum, Kubilay. The last time my wife & I visited Turkey, we went through a practice session of Eishin-Ryu with another iaidoka in Istanbul. We had a great time critiquing each other's style because our waza were similar, but a long way from being identical. I know an Araki-Ryu sensei in Arizona who broke completely with his shihan because he simply didn't agree with the precepts. As godan, I wouldn't feel comfortable in establishing a separate ryuha, but he did, giving it his own name. So it's not all that unusual for new styles to be created even today.
Ken
Ken Goldstein
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Judo Kodansha/MJER Iaido Kodansha/Jodo Oku-iri
Fencing Master/NRA Instructor
"A positive attitude may not solve all your problems, but it'll annoy enough people to be worth the effort."