I think it may suit the purpose to also include some Dabbaba-riders or something like that. I never played a game which uses flying pieces, so I dilettantly assume that the Eagle is too valuable to use it for an explicit attack unlike DR which can control only a quarter of the board space, and so can be forcibly exchanged for something more valuable. I think it can be more efficient to use such types of pieces, rather than expanding new rules which govern their relations (#2).
I think it may suit the purpose to also include some Dabbaba-riders or something like that. I never played a game which uses flying pieces, so I dilettantly assume that the Eagle is too valuable to use it for an explicit attack unlike DR which can control only a quarter of the board space, and so can be forcibly exchanged for something more valuable. I think it can be more efficient to use such types of pieces, rather than expanding new rules which govern their relations (#2).