User blog comment:B214/High School DxD BorN Episode 10 Review/@comment-25072311-20150607053456/@comment-3965848-20150607131511

1. It's clearly stated in the novel and in this episode that Issei lost most of his life span due to JD, without even mentioning the power taken from Vali/Albion, Issei's Dividing Gear only took little compared to how much JD took.

2. Vali is able to avoid the drawbacks of JD by using his demonic power insted of his life span.

3. Issei has only used JD only once in his life and thats when he went out of control