Think about people who have performed well in their one chance in international cricket but they just cannot cement a place in their international teams. Think about people like DD Gupta for india, he was a opening batsmen, wicket keeper... in his first test he scored 104 off 86 i think (i could be wrong) and took everything behind the stumps but because of sehwag they dont need another big hitter to open the tests, and after that he played like crap and therefore u have never heard his name ever again