User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-34061653-20180506195121/@comment-28884330-20180507182424

If Riser can fight Sairaorg like how Issei did then yes, he would be roughly comparable to him. Issei is comparable to Sairaorg. Them training together offscreen does not guarantee they fought on par, but if they fought on par without any indication of any of them holding back, then yes, they would be comparable.

Lint having a better weapon is much more significant than Cao Cao having a better weapon than Issei. Issei has shown to have a knack for improvised strategy, as proven by his battles with Riser, Cao Cao and Vidar. Irina has never shown something similar, so assuming her battle with Lint would turn out in a similar way doesn't make sense. Unless shown otherwise, Sha Wujing can be assumed to be roughly comparable to Bikou and Zhu Bajie by them being part of the same group, even if a bit weaker. And Lint did not use her Balance Breaker in this battle, so it's not really a fair comparison, not to say that Sha Wujing being a water specialist has affinity against a fire user.

Yeah, in a member by member basis, Rias' team is more vulnerable. Then again, Issei's team also has a few key members that would damage his team if taken out, and Rias' team, on a member by member basis, has several members that counter those of Issei. Valerie's vulnerability has been taken advantage of already, so it's likely that Rias will take countermeasures for it in future games. And Ravel can be easily defeated by, say, Yuuto or Lint. Particularly Yuuto. After all, holy attribute attacks have shown to heavily limit a Phenex's regeneration, like Issei's boosted holy water did on Riser. Holy swords and holy flames would be even worse, and Ravel is not as strong or durable as Riser is.