User blog comment:B214/Volume 22 spoilers/@comment-190.164.227.239-20161125214128

i think at the beginning of the tournaments between the top 16 the matches will be issei's team vs sona's team, were saji is going to fight issei and unlock vritra's breakdown and then lose, then it will be rias' team vs vali's team, where rias will use her power of destruction in a similar way sirzechs used it in his battle against trihexa, forcing vali to fight her in  his dxd form