Well the team rating is based on the weightings of skills for each position and the skills of each player.
The player Trikster wrote the code, which basically takes a set of weightings and then decides which combination of players gets the best score.
To put the individual weightings in here would take too much space.
The point of this is to show new players how to best set their lineups.
---
I may at some stage allow for customised weightings that allow individuals to save them and allow them for public scrutiny. But currently I dont really have the time to do this.