User blog comment:B214/High School DxD BorN Episode 10 Review/@comment-182.69.39.172-20150609175230/@comment-23853100-20150610140317

I wouldn't really say that Vali is cocky, he clearly knows how to respect a few people that deserves it.

In fact, a bit of spoiler here, Vali shows Issei the utmost respect for him when he told Euclid that he will only use the EJOD on Ise not a fake like Euclid.