I do not see the point at all of the above.

The fields aren't big enough for 6v6
I have no idea what the driving force behind this is except to maybe make it easier for the NNSWF staff to see the players.
Small sided 5v5 or 6v6 is not going to be a true reflection on how some players actually perform in real games.
Using the small sided games to determine how teams are allocated into the appropriate competition level is a farce.