"it’s additive not multiplicative ."
That's a good way to put it.
But something else has to be missing here. Look at this guy
Lewis
He gained zero points in LP despite
-Between 53-63 WE (depending on point in time during season)
-zero practice min
-Rating score mid range of 67
-being Green which indicates that there is a lot of growth left.
-playing 31mpg and 31 starts
Compared to Jefcoat gaining 2-3 points in speed, defense, BH and ST.
- between 71-73 WE. So decently higher than Lewis but not THAT much higher
-zero practice min
-rating scores of high 80s so towards the higher end of the rating spectrum so it should be less.
-black ratings indictating less than 20 points remaining
- 17mpg and zero starts.
So 10-15 WE points negates everything else you've said impacts rating increases/decreases. Seems off to me.