Unrelated ramblings:
I'm beginning to think that, besides being the climax of the story, Cascade marked an interesting turning point in the structure of the whole thing. Prior to it, virtually every time loop existed for the purposes of ultimately screwing the kids over or demonstrating how powerless they were against the inevitability of fate. Since Cascade, though, we've seen what I think is the first example of a villain being constrained by a time loop, despite full knowledge of its existence - the Condesce cannot kill the Alpha kids (as I'm sure she wants to). Until recently, the bunny trans-timeline shenanigans necessitated their continued existence, but now with the Cherubs being introduced, I think we might be coming up on a larger problem for the antagonists. If, as seems heavily implied, uu later becomes Lord English, then any interaction he has with the kids forms another loop. They can't die until they've had every interaction with uu that they're going to, which means that if they defeat Lord English and then have a pointless conversation with uu afterward, they retroactively guarantee that he cannot kill them before they kill him.
Of course, this being Homestuck, we're probably going to go off in some other direction entirely, but still.