User blog comment:DeathGodPrayer/Talk About What You Want!/@comment-85.154.145.2-20140120193118/@comment-24331253-20140120210143

I think it is possible for this reasons;

1. Issei is still growing, he hasn't been a devil for that long (for only little over ayear)

2. Its highly possible when he fully masters his boosted gear afterall Draig and Albion's power were said to have been one of the top 10 in the world during their prime

3. His rivals/opponents are begining to range from ultimate to God-class opponents

4. Personally, I think the current heavingly dragons (Ise and Vali) could end up surpassing Draig and Albion in the future. They have a wierd kind of irregular growth.