actually potential has NO influence at all on training until the limit of a player's capacity is reached.
players with a higher potential can keep getting much better from training longer then players with low potential.
an example to clarify:
2 identical players, 1 with potential 10, the other potential 3. Everything else is the same, they get the same training every week:
at first both players will raise equally, so they will be equally good for a time. then, they come to a level where the potential 3 player has reched his limit. At this time, both players are still equally good and perform equally good on the court.
From then on the level 3 player will only improve very little, while the potential 10 player still improves with big steps. A litle later the potential 10 player will be much better then the potential 3 player.
They are not your friends; they dispise you. I am the only one you can count on. Trust me.