its should be easy to understand
if you are attacking ->those players with red arrows are going further into next position (as a support)
if you defend yourself --> those players with blue arrows are going "back" into position (as a support)

I noticed i.e. that MC (MR ML) w/o any arrow are not going into the GC box but are passing or shooting from distance (the exception is the corner or counter-attack)

but if I'm right? no idea:/