User blog comment:B214/Volume 22 spoilers/@comment-50.139.232.230-20160721023809/@comment-24.113.252.213-20160721045712

I honestly think that Issei is a "react to the situation" type of person. In almost all of his fights, Issei didn't start of slow to feel out the situation, or hang back to stratigize. He just charged and attacked head-on, and if that didn't finish the job, he reacted to whatever his opponent(s) did.

That's not necessarily a bad idea. Taking the initiative in a fight is one of the most important keys to achieving victory. However, Issei is a famous figure, so his fighting style and abilities are well-known to pretty much everyone. And Issei is going into the IRG practically blind. Issei only knows a handful of the people participating in the IRG, so he doesn't have anything to strategize against.

So Issei is really using the only good tactic he has available to him: Take the initiative and attack first, don't give the enemy time to react. And if the first strike doesn't finish them, keep them on the defensive, and overwhelm them.

That's my opinion anyway.