Board Thread:General Discussion/@comment-1155842-20140425085530/@comment-1155842-20140426171658

Egypt was occupied by the British at one point so influence of English was entrenched there, presumably Avdol would not have problems with English. Italians are known to stick to Italian unless their occupation requires English, so yeah, that's a potential issue. But since Gyro is in the USA, he is more than likely required to learn English. Pillar Men knowing German and English instantaneously wouldn't be farfetched, given that they have extreme intelligence, so that scenario is very possible.

Another thing I see into Diamond is Unbreakable... Tomoko is a college girl at the time she meets Joseph. By college, Japanese students have exposure to English, therefore Tomoko might have some skills of English, but because Japanese people have no one to practice their English skills with, their ability is very limited. Josuke might not even have a single ability to converse in English at all, as English proficiency for high school became mandatory just fairly recently in Japan. At worst, there are much code-switching between Joseph, Josuke and Tomoko, but as mentioned, Joseph's Japanese ability was not yet that good at the time of Stardust Crusaders. He might've had enough time to hone them after the events, which can explain why he could converse with Tomoko and Josuke.