JMST is post-BB GMS

Exactly. GMS has the most content so translation KMS into GMS first, then into other languages like Chinese, Japanese and French makes more sense than finding Korean-Chinese, Korean-Japanese and Korean-French translators (who would charge more than English translators)



BB refers to Core Blaze in JMS I thought he was referring to Neo Tokyo.

God, translations into english are not because GMS has the most content. It's because structures for all languages are easier to be translated when english to that language, and since english is the universal language.
.
Also, BB always meant Big Bang, it's the most obvious abreviation used here and even by maples. Although BB may mean Blaze Break, who refers to Core Blaze's quest, only a JMS player might understand that. It's not common sense, it's acquired knowledge through a little gameplay on JMS until you find that out from megaphones.