User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-16281343-20141026010620/@comment-24468758-20141029175553

I would say if Issei got his EP now he would only use them if he meets someone he would want in his peerage by chance (or rather his dragon's trait of attracting people), but he definitely wouldn't have the time to look for them for the reasons you already mentioned.