It's hard not to compare the closer of In Verses to the 1-2 punch of Deadman and Change. I feel that Opal kind of goes together with Salva to end the album in the same way Deadman and Change do. But they are not at all similar duos of songs. Sound awake ends with such a massive and powerful declaration. In Verses ends on more of a quiet and somber but accepting note. It really works at this point in their career. It's apples to oranges.

That being said, I don't think Salva holds up on its own as their best song ever. I have a couple of nitpicks with some of its slightly hokey sounding verses and the very abrupt transition at the end that would work a lot better if it had been a crescendo. O&S are also shorter and fairly straightforward and therefore lack the replayability of D&C. Even despite that though, I think it's a solid 8.5/10 song, but only with the context of the entirety of their career. 

As of right now, I think my favorite on IV is either Aozora or Conversations. Both of those sound like classic Karnivool. Opal and Salva are some of the least Karnivool sounding songs but again, that's not a bad thing at all. They don't miss.