What do you mean by the end of Conan TV episode 473?

That man is Kidd's father. The name Kidd was actually given by Xinyi's father, so the thief, the father who fights fast, took Xinyi's father as a question mark left by his father Kuroba Touichi, meaning "Can you catch me next time?"

The exclamation mark left by Kudou Yū saku means "Of course!"

There should be something wrong with the translation of the animation you saw. This is the original comic book.

/comicadata/Conan/055/077.jpg, so he called himself Shinichi's younger brother.