Oh dear, this is a right mess, isn't it?
It is immensely difficult to have conversations about race and ethnicity and keep things civil and insightful, but right now we're doing a really poor job of it. I think I can appreciate the principle behind what Ben is saying, unfortunately he is phrasing himself incredibly badly.
What (I hope) he's trying to look at is genetic predisposition - there is no denying that black/Afro-Caribbean origin contributes to success as a sprinter, but let's think about this - who was the last white guy to win the Olympic 100m? Similarly Kenyan/Ethiopian stock is clearly better suited to middle-distance running. I think I have read that this is due to higher blood cell counts due to altitude - though I guess this doesn't explain the lack of Bolivian 1500m runners.
Whites of British/Caucasian origin are, historically, on average, taller and stronger and in possession of more fast-twitch fibres than those of Asian origin. A quick search suggests Indian males average 1.64m (
India Times), whilst in the UK it's 1.77m (
NHS). For me, this contributes towards explaining the extra depth in the fast bowling stocks of "white nations" over earlier decades - whilst Asian genetics seem to lend more flexibility and better suit the development of spin bowlers and "wristy" batsmen. Of course weather and pitches also come into the equation. This is one of the great beauties of cricket - a game that can be played in different ways. Saying that, there seems to have been a significant increase in the number of taller, faster bowlers coming out of India lately.
Then we have the question raised by SJS and Brumby about proportional representation in the English teams. We are "over-represented" by Black or Afro-Caribbean players, and "under-represented" by British Asians in football, and vice versa in cricket, if you compare the percentages of the population of a particular ethnicity to the percentage of International sportsmen. I would venture that this is more of a cultural issue, and an interesting discussion as, to give the national side as much success as possible, you do not want cultural divides preventing children from gaining access to sports. I do think, though, that white English boys are still playing and enjoying the game as much (if not more) than I've seen through ten years of working in the grassroots - and white English girls are playing more than ever.
There is no reason why this subject is not one that can be discussed, but we do need to go about it in a more informed manner - let's try and use sources if we can for any potentially controversial claims, and think about how what we say could be interpreted: as well as trying to appreciate how any posters intend their meanings.