User blog comment:B214/Volume 22 spoilers/@comment-86.153.129.0-20160816033044/@comment-9595671-20160816155748

I think the best way to know the answer to that is to know if what Gasper did during the terrorist attack on the peace conference is something most Vampires can do, a skill that Dhampirs get form their human heritage, or if that's unique to him through because of his Sacred Gear.

If Elmen can do that too, then she'd likely be a powerful asset to him temporary or permanent. Perhaps that's why we didn't see much of the pure Vampires' skills when Rizevim showed up in the story, Ishibumi was likely waiting for this arc to show what they could do.