Can you explain better what's going on with blue and red arrows at Formation screen?

I was wondering if its just "Red = Attack", "Blue = Def", "Flat = Mix" or is something more advanced like "Blue on a Striker = (Like Messi in FCBarcelona), go to mid field to get the ball and then attack.

Do we have some official fonts/faq about this?

Thank you so much

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Edit: Just another one, do you have contact with any developer of the game?