Buffs is right. When you level up and the Values/Wages are the same for all players, you can't recognize a fast trainer.
There are at least 3 classes of nordgen.
The fast , over +100 in 3bars/practice
The good, round +80
The average +60
* those are avg numbers
** I never bought lower class but must be (as older age nordgens)
They are all from bot teams but have difference in their value.
In higher levels you can't recognize what "class" he is. You just buy him and test him.