DxD fans please answer this.

I know what I'm about to ask is probably really stupid 'cause I'm just about to sleep, but I had to ask this question.

What if Issei was in Lostbelt 6 and was one of the Fairy Knights? How his presence would effect the story? How'll he interact with the other Knights and Morgan-sama? Though I'm mostly interested in his interactions with Melusine, which is the sole reason why I'm asking this.

Also for his power levels, I think Cardinal Crimson or regular DxD armour is fine; AxA is too powerful.