User blog comment:Ixarising/High School DxD Dream Battle/@comment-71.108.70.155-20140120005532/@comment-1359322-20140123082321

After some thinking i still say that Sirzechs would win even if he fights an adult Issei.

Sirzechs has master his POD to the point he could even negate attack with it. In his true form, Sirzechs himself becomes the POD, so basically most attacks are useless against Sirzechs.