It is highly unusual for the big superpower clubs to be dominated by home grown products - there is a side in Essex called Wanstead who who the national season before last and were purely all homegrown youngsters. Ableit at least 4 were on the Essex staff where the vast majority of the rest of the side had played county seconds and just missed out on county contracts in their formative years. However, this is highly unusual and you will find in which ever league you look the big clubs will often have a nucleus of 4 or 5 homegrown players who didnt quite make it who then attract the best players from other clubs through contacts by either player county seconds or minor counties.