Board Thread:Wikia Discussion/@comment-25683568-20150717101921/@comment-25227601-20150722165703

I don't believe it actually affects anything wikia-related in the long run (or affecting important stuff like strategy-forming during events).

For technicalities, "Kai Ni" would simply be official due to the fact that the game writes it as 改二, i.e. in kanji. There is also technically nothing wrong with Kai 2 because Japanese textbooks do match Arabic numerals with their kanji counterparts as well.