User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-26865730-20150814184919

At the end of Life 3 Belial says:

"I too want too play a game against you after you create your own group.

So, please wait for me."

Did Belial scope Issei in Diabolos Dragon form and now become another of Issei's muscular fans? Or was that just a simple invitation to a match sometime in the future? It would have been pretty impressive for Belial to witness that much power after the transformation.

I wonder if Belial could use [Worthless] on DD?

It seems that DD has the property of "infinity", I'm guessing that means that whatever it is against, if it has a limiting factor of any kind, then Infinity Drive will overcome it.