User blog comment:B214/Question and Answers 6/@comment-190.164.227.239-20161201033222/@comment-29963364-20161205011316

@Omega

I have a feeling that the the past possessors of the Boosted Gear are, in fact, pretty damn strong if Issei is still considered the "weakest."

Remember Vasco Strada? And Ewald Cristaldi? They are just normal humans, and yet they were strong enough to single-handedly fight a DxD team each.

* Strada: He's as physically strong and fast as Sairaorg (without Touki or Regulus Armor).

* Ewald: He's definitely not as physically strong, but still as fast. But his true strength comes from him being a tactical genius. His fighting style is similar to Cao Cao (with his Balance Breaker).

If humans are capable of producing these kinds of fighters, then it's likely that some, if not most of, the past possessors of the Boosted Gear were at least comparable. I have a feeling that the Strongest Boosted Gear possessor, Belzard, was on par with Vasco Strada in his prime. Although since Ddraig never commented on this topic, we'll never know. But it would've been nice if Ishibumi wrote something like that in, so that we could get an idea of how far Issei is from being the "strongest."