You can't judge him for defending himself. Everyone goes on twitter and other social networks firing shots like they are saints and they know everything.
The article speaks about Salazar and Rupp, Centro can well be clean, and I think he is the kind of guy who is a genuine racer. His times are not outstanding and that makes sense for someone who is CLEAN.
About NOP and the rest, yes this is disgusting news about something many thought to be a role, but in the end, how many more can say they are clean? Why to not question everyone else? Why don't those journalist go to Kenya dig some shit up? General sense is so dumb and human thing. All of you never respected what NOP did and even they were clean you would always shout out loud they were the worst dopers ever.
By the way, I don't buy guys like El Guerrouj, Bekele and that kind of "legends". They must have come from other planet, if, of course, they are CLEAN..