[MaskedRiderAsakura]

It's been a while since I've seen Gaim, but doesn't DJ Sagara state that the reason Helheim kept invading other worlds is because the last "winners" let Helheim take over, whereas Kouta took Helheim somewhere else and built a new world without destroying the old world (unlike what Kaito wanted to do).

And wasn't Kouta's whole thing about "breaking down the rules that require sacrifices" regarding the need for the death of innocents in order to save the world? Kaito wasn't innocent; he was willing to commit literal genocide to build his ideal world. And sure, Kouta understands by the end that Kaito's intentions came from a good place, but at the end of the day, he was still going to kill a bunch of people. I wouldn't say that killing Kaito is a "sacrifice" any more than killing Redyue was a sacrifice (granted, Redyue was just pure evil), since Kaito is the direct cause of the current conflict.