User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-12.188.116.28-20181230213822/@comment-71.221.38.212-20190107201123

Regarding your comment, Mitsuya Kanzaki has the Longinus-Class Sacred Gears loaded into terminals on his gauntlets. Kiba's are directly connected to his soul. Consider that the unattached exert a far smaller strain level on a person than those anchored to one's soul. That's likely why Kiba is still working on it. It's one thing to strengthen the body, another to strengthen the mind; On that note, strengthening the soul is a far more daunting task altogether.