H. G. Muller wrote on Tue, Mar 6, 2012 12:17 PM UTC:
FD might not be a good idea, because it is color-bound, and you already have another color-bound piece in the array. (I like the piece, btw; I wonder why it is not used more often.)
I think a (3,0) move is indeed not too dangerous, because only one of those goes forward. And it is forward long-range forking power that wrecks the game. Without any input from play testing, I would think that the Frog would be the nicest piece. The others seem a bit awkward, without any short-range steps.