User blog comment:Crimson and Darkness/Shin DxD 4 discussion/@comment-83.46.70.234-20200131142745/@comment-46.106.255.39-20200131161037

I have a theory. Sairaorg was aware of the fan letter Balberith (ie Bal-kun) wrote to Issei. On this occasion he will recognize him and remember that Balberith is that child.