I have only just started playing and I find this discussion interesting. So far I have found the knight attribute extremely helpful and i think this is because it is the beginning of the game where there are more pieces and fighting is at closer range. I expect, as with the knight, the advantage will dimish slightly as the game progresses and the board becomes more open. I can see why the the Janus and Chancellor are closer in values than the Bishop and Rook as the Janus will not be restricted to one colour diagonals but I am not sure why it should be worth more as the Cancellor has the ability to cover an additional two squares.