I think the historic evidence rules that out; Dai and Maka Dai Dai Shogi were of much later date. The shrunken version of Dai is Chu Shogi.
BTW, it is quite unlikely that the Flying Dragon moved as a Bishop. The only known rule description uses another word for its move as it uses for sliding in the other pieces. Much more likely it meant that it moved as a Flying Dragon from Dai Shogi. As its name suggests... IIRC its promotion is completely made up.
I think the historic evidence rules that out; Dai and Maka Dai Dai Shogi were of much later date. The shrunken version of Dai is Chu Shogi.
BTW, it is quite unlikely that the Flying Dragon moved as a Bishop. The only known rule description uses another word for its move as it uses for sliding in the other pieces. Much more likely it meant that it moved as a Flying Dragon from Dai Shogi. As its name suggests... IIRC its promotion is completely made up.