He is replacing a World Cup winner and is his country’s first Premier League keeper, but Villa’s new signing has already dealt with harder challenges In November 2001, the first Japanese goalkeeper to play English league football conceded a goal within the first minute of his debut. Yoshikatsu Kawaguchi may have struggled for second-tier Portsmouth, conceding 21 times in his 12 games after being spotted by the then-director of football, Harry Redknapp, but he also produced some world-class save…