Hidden mmr was originally introduced as an attempt to counteract the smurfs in games. For instance, if a diamond 1 player dropped down to gold, they would play other diamond 1 players 'labled' as gold instead of actual gold players because...

when watching VODs or matches i notice that pros tend to face backwards when crossing A long in haven to get behind the boxes. im not sure why they do this but my theory is either it's somehow faster, it somehow hides your model, or to dod...