Black Goalkeeper's

[Bluebina]

https://www.bbc.co.uk/sport/football/48147087

Just seen this article, and it is a topic I have heard discussed before. It is strange, when black footballers make up a huge demographic of professional football, that there are so little goalkeepers.

Is it social bias as the article suggests?
Cultural?
Or simply is it just an unexplained phenomenon that there are hardly any half decent black goalkeepers.

I've always noticed this and the ones that make it are rubbish, I've no idea why? Goalies tend to start as players that aren't good enough to play anywhere else and give it a try, most kids want to be a Striker and then if they are not good enough work they way back through the team, with the shit ones often fat ending up in goals !!!