Platini went on to realise his potential, especially after captaining France to the 1982 World Cup semifinal and joining Juventus, where he scored lots of goals and won many honours both on and off the pitch. But Platini said that only when he joined winners at Juventus then he realised how hard you need to work to win. So when you get a player of Platini's skill realising his potential, then you get history in the making.
Platini himself says that the year when he played best was his final year in France in Saint-Etienne, before joining Italy and Juventus
Then well he didn't need to join what you call the "winners" ... that means not French as I understand well
to fulfill his potential
Gasquet has gone the way of too many French players of the last 30 years (LeConte, Pioline, Tsonga, Mathieu etc etc). These guys have incredibe talent and yet can't make a name for themselves, they just don't seem to have the will to win. Luckily for France, Amelie Mauresmo bucked the trend as she was going the same way until she won those two slams plus the year end championships between 2005 and 2006.
Leconte was a great talent (technically better than Gasquet) but with a bad physique, and already in that time you couldn't do anything without a good physique, ask Nalbandian
The other ones were not great talents, and Tsonga has been hampered by injuries since very early in his youth.