If Sindhu have had participated this year, she would have got the gold medal. She is better than all the three girls you mentioned. She beaten all the three girls recently. 1) Tai tzu ying - Got beaten by sindhu in 1st round of Indian Open Superseries. 2)Busanan - Got beaten by Sindhu in semifinals of Asian Badminton Championships 2012 3)Nozomi- Got beaten by Sindhu in Finals of Asian badminton Championships 2012 Sindhu is continuously improving and has beaten even Olympic champion Li xuerui. She is just 17. She has two more years to participate in these championships.