Xavier and Addie will totally get along. :] If Leo has tutored Zav in Potions in the past, that could give them cause to be more familiar with each other! Zav is pretty outgoing and chill and his troublemaking tends to be more self-destructive (with frequent inadvertent surrounding fallout), so they would probably get along, generally?

Xavier is a MACUSA kid that has specifically been targeted by the press in the past because his mother used to drag him around and show him off for being "gifted" but then he kept struggling in school and acting out and became an embarrassment. This was generally at the local level and not huge news, so I'm betting Ferdinand's mom was way more interested in high level stuff, but Zav may still be a bit wary of him.