I doubt that someone who is not already familiar with Cannons could deduce all the movement rules of the Cannon and Arrow from those diagrams.
The Pawn diagram does not indicate whether it can cross the river (as every other diagram does).
Is the rook really estimated to be worth only 8/7 of a bishop? The bishop no doubt benefits from the wide board, but that's a larger effect than I would have guessed. Is there another factor I'm missing?