User blog comment:B214/Shin DxD 1 discussion/@comment-175.138.188.184-20180926082732/@comment-28884330-20180927223430

It was enough because it allowed Vali to land all of his demonic power shots which were gradually shredding Crom. Not only that, but you act as if Crom was moving like nothing through Half Dimension, when the fact of the matter is it required so much effort his grit his teeth until they drew blood. Issei can easily repair his DxD armors, so there's no reason to think Vali cannot or wouldn't do it.

Vali wasn't nearly as exhausted as Rias, and the main thing that led Rias to retire is adverse effects the form itself has on her as stated by Gasper, with the fatigue just representing a loss in effective strength. With Crom and Vali, Vali's exhaustion wasn't nearly as emphasized as Rias', so it is baseless to think they were tiring out at the same rate, while Crom was either as injured as Fenrir or even more injured, considering he couldn't avoid a single one of Vali's attacks while Fenrir could avoid some of Rias'. Crom's defeat was just as inevitable if not more because he was constantly receiving damage and was forced into a "hit or die" situation.

How can you say his slash is stronger than Cross Crisis? They have never been compared. You have absolutely no base or precedent to say such a thing. Yeah, Xenovia would have to expend stamina attacking and moving, but considering she needed two hours to be tired out even when having to expend stamina on defense, there's no reason to believe she cannot hold Strada long enough. Even just an hour would be an irrealistically long battle, and she has proven more than capable of fighting for that long even when having to defend.