If we were to theoretically add the 8 CGs to the existing 15, my personal best bet would be to add another scene to the existing sets. Like one of them leads to a blow job, this means you're going to get scene 1 and 2 from the 8. And the path where she gives a hand job leads to scenes 3 and 4 from the 8. It would keep the same RNG and just make it be longer. But honestly I'm not assuming this would happen to begin with.Oh, yeah, I mixed up the numbers, but either way, 23 different CGs tied to RNG would be horrible. It’s better to keep things scripted or, at the very least, in small CG packs; maybe in different sections of the quest, so players can actually trigger all of them.
Every battle update has Asuna in a different corrupted state so the previous battle CGs wouldn't make sense, especially if she ends up changing outfits. But anyways if we were to get a battle update this time, it would probably look like she's more willing than her previous ones so they would probably all end up different.
Anyways I'm not expecting a battle update and I'm happy to see we're going the expected path of more FOG scenes. It would have been pretty lame to not focus on Asuna after last update.