As the U.S. Men’s National Team is finalizing its preparations ahead of Friday’s World Cup opener against Paraguay (6 p.m. PT), the biggest question facing head coach Mauricio Pochettino was the team’s defense. And by that, the real question was about the health of defender Chris Richards and his balky ankle . Michael Duarte of The California Post captured video Monday showing defender Richards participating in training with the squad at Great Park in Irvine, a notable development after the