User blog comment:B214/Volume 23 discussion blog/@comment-31764731-20170801233721/@comment-26709288-20170802010241

Yeah but that's all the two have going for them: strategy with not that much power

Issei on the other hand already has decent power regarding him and his team, he has the strongest Queen of the Underworld, a vampire who can take people's powers by drinking their blood, an angel with a holy sword, a former exorcist turned devil with an ultimate class holy sword, a dragon king's son, and a Phenex. All he needs right now is a strategy to utilize his team to the fullest with strategy and I believe he will have enough to take on even Gods.

Issei already has the god-slaying weapon by his side. I don't think a form that can only last a few minutes and will hurt him immensely is what he should be trying to utilize at the moment. He should instead focus on what he has already and use strategy to bring out his team's full potential.