In my experience, it does change somewhat around 5th. I have seen the more aggressive Middies with good stick skills change to poles. I have seen the kids with the better stick skills, better hand eye coordination and a penchant for the game move to Attack. And the runners stay at middie.

Those kids who were buried at attack no longer have a place to play. get moved to 4th line middie Never a good thing to get buried on attack