User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-3965848-20150515062944/@comment-3965848-20150515162959

Y'know that did cross my mind several times before but wouldn't have Issei used it against Rizevim, the fact that he didn't gave me doubts about it.

Although if the reason he didn't use his Wyverns was because he wasn't able to do so at that time (maybe due to using Longinus Smasher), then maybe there's a chance Reflect can negate SG Canceller.