TOKYO—Even without Simone Biles the United States will still offer a steely defence of the Olympic women’s gymnastics all-around crown worn by an American since the 2004 Athens Summer Games. Unbeaten in any all-around competition she entered since 2013, Biles was considered a lock to defend her title until Tuesday when the 24-year-old sent shockwaves through the Tokyo Games after dropping out of the team event following her opening vault. In a stunning admission Biles later explained that the pressure of living up to expectations and her quest for a record gold medal haul had left her no choice but to drop out for her own mental health. USA Gymnastics (USAG) confirmed on Wednesday that Biles would not take part in the all-around but did not rule her returning for next week’s apparatus finals. “After further evaluation, Simone Biles has withdrawn from the final individual all-around competition at the Tokyo …