User blog comment:B214/High School DxD Hero Discussion/@comment-103.7.39.18-20180627002849/@comment-181.115.109.33-20180702204353

If you are talking about juggernaut drive then only Vali can control it and just for a little bit. Issei will still go into a berserker state if he uses it, thats why he discarted JD for this new form he is showing. Just like Vali will do in a cuple of volumes later.