User blog comment:B214/Volume 22 spoilers/@comment-95.90.227.198-20170206220903/@comment-31137559-20170206225128

Just sounds like you want Issei to be overpowered. A little patience because it is already confirmed that Issei is going to be a future Super Devil. And most likely Ouryuu has his own team. Amd why would Issei need a bodyguard. Not saying that he can't have one. But why an Asura when he has Xenovia as his knight? And what would Shiva teach Issei. Issei has had all the power-ups you can dream of. What more does he need?