I think primarily it's their foray into the Japanese market (bear in mind they hadn't officially released anything over there yet); the digital album doesn't include them, but the physical has Japanese versions of Double Knot, Levanter and My Pace.
On top of that, of course, it gives them a platform to re-release all those previously released tracks in their new eight-man format.
Yeah, I get that. But what happened happened for a reason, even if we don't know 100% what that reason is. I feel like SKZ have worked through it and come out in a better place...