I think the arrows are a still misleading, a brief explanation the recent Q&A did nothing to fully understand them.
I still work on justdomes theory that the move in the direction of the arrows depending on the two phases of the game.
Forward arrows: move forward one square when in possession and down arrows one square when out of possession.
But to be totally honest I have my doubts as to their effectiveness.
The number of time I have played 'Mentality Normal' with down arrows on the centre DC of three, to read he running through on goal. at best!
Another reason why random goal scorers appear from nowhere and strikers make last player challenges, engine grew with Neanderthal man.