User blog comment:B214/Shin DxD 1 discussion/@comment-5.36.111.208-20180711193145/@comment-10330822-20180712032517

He managed to take on Sairaorg in a melee while the latter was using Imperial Purpure, which was strong enough to defeat a Satan-Class. So, I feel he probably could kill a non-Satan-Class Ultimate-Class devil.