Ratings and Player Growth Opportunities

Here's how I am generating every team, their players, and how teams will grow through the season:
-Each team will maintain a roster of 23 players. Additional players will be removed from the team based on an abundance of position.

-Players are given Names generated with a random name generator, but will maintain the physical build of the player used as the base. No players have traits at the start of the first season.

Each Team will begin with players at the same rating, all according to the league the team begins in:
-New Minor League Teams begin with stats at 46
-New Major League Teams begin with stats at 48
-New Prime League Teams begin with stats at 50
-All Teams that participated in Last Year's Prime League will retain their player's rankings

All Teams are given the same number of Player Growth Opportunities:
Player Growth Opportunities are given after the following weeks: 
-Friendlies Week 1&2
-Minor League Week 3 (2 if bye)
-Major League Week 4
-Prime League Week 7
-League Cup Home Legs of Rounds 1 and 2

Player Growth Opportunities work in the following manner:
Positive PGOs 

-All players that participate in a match receive a +1 to every stat.
-Players that score an 8.0 or higher receive a random trait.
-Players that score a rating of 7.0 or higher receive +1 to every stat.
-Players that score a 6.5 receive +1 to 10 random stats (which could be duplicated)


Negative PGOs
-Players that score a 4.5 or less lose a trait
-Players that score a 4.0 or less lose 1 to each stat (If possible)