I don't know if people thought the same way I did but up until this chapter, I believed Roshi's Magma style or Lava style was a result of a KKG passed down through family heritage. It would be comparable to the Mizukage's Lava style variation, who has multiple KKG's and is not a jin.
I always believed that he was chosen as a Jin BECAUSE he was strong and had things in his arsenal like Magma style. Turns out his trademark ability is simply borrowed from his Biju, too bad if you ask me.
I always believed that he was chosen as a Jin BECAUSE he was strong and had things in his arsenal like Magma style. Turns out his trademark ability is simply borrowed from his Biju, too bad if you ask me.