User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-25792629-20150627232111

So far I've seen that Issei's development is due to very stern and emotional situations, if the author does decide the kill of Issei's parents, everyone should be praying for the sorry fool who was stupid enough to pull the trigger on them, as we've already seen what Issei can do when enrage in JD. I'm getting the impression we can be expecting a new growth in the Boosted Gear, far different from True Queen or JD, perhaps something much more powerful, since the death of Issei's parents may trigger such emotions which the Longinus relies on as it's source of power... hmm, we'll see.