User blog comment:B214/Shin DxD 1 discussion/@comment-2607:FB90:3851:A5D3:0:14:ECCB:7501-20181029115052/@comment-2607:FB90:3851:A5D3:0:14:ECCB:7501-20181029202327

You're giving vague answers and not explaining what makes Rias a wall. Is it because she's another team in his way from getting to the top? What makes Rias a wall? For example, Grayfia is a wall for Rias because she much stronger than Rias and also Rias suffers from an inferiorty complex when it comes to Grayfia. Vali is a wall for Issei because Vali is his destined rival and he has been ahead of Issei since the beginning. Strada is a wall for Xenovia because because he's stronger and he's her predessor. Is Rias a wall because she's a better king? If so then Issei has already beaten Sona who is also a better king.

Issei only entered the tournament because his rivals entered. You say he wants to prove that he's her equal. In what way?