This info was a real game changer for me.

I didn't know it was like this. Does it mean there are not pre-programmed players in the game ? As much as i understand, every time players are
initially re-programmed according to their new signed teams situations(good performer cap). May be set based on low or high performance, the chance depends on how many good players you have before new signing.
If i transfer my opponent legend player, he might be underperforming in my team or Player stats are not important when you decide to buy a player. Can you explain more please ?