User blog comment:Kololz/Replace 'A' to 'Kou'?/@comment-4417530-20150927124010

If you want to keep A/B/C then you should change all "Kai Ni" into "Second revision" and redo all of the translation we have had before.

I don't know who came up with "Kai Ni", but doing so will create many inconsistencies in translating later on (Like this one we're having).