Yo Son was Wylin Butt ass Naked attacking people in the Subway! NewsOne Reports The naked BART gymnast has been identified as Yeiner Garaizabalo, 24. He goes by the name of Yeiner Perez, a former circus acrobat who is believed to have suffered a nervous breakdown. According to Slim Chance, a friend of Perez’s who leads the Berkeley circus troupe ClownSnotBombs, he had been going through tough times and stopped showing up to practice in May. “He’s been through a lot of stress — he seems to have been having a breakdown,” said Slim Chance. “That seems to be the tip of it right there. I just can’t tell you anything more because…