How the hell does Lisa Ann deserve to get listed with the other three? She isn't even close to being in their league. Even in her prime when she was younger she wouldn't have been close.
One of these things doesn't belong. One of these things is not like the others.
Nina might be one of the best pornstars out there, maybe even a historically memorable one, you could even make an argument was is one of the top 2 or three best now, but considering both Aria and Gisele are probably going to be some of the top adult models....like ever (and Aria could already be considered in that category), even if Nina was paired up with somebody on her level they still wouldn't be as good as the Aria/Gisele pair.